Flora & Plant Communities

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Last updated: June 15, 2026

Marion County's plant life reflects the collision of three landscapes: the sandstone caprock of the Cumberland Plateau, the limestone-floored Sequatchie Valley, and the Tennessee River Gorge. Each has its own soils, its own moisture regime, and its own flora. A hike from the Sequatchie River bottoms up onto the plateau at Prentice Cooper passes through at least four distinct plant communities in under two miles. This page walks through those communities and names the species most likely to catch a botanist's eye.

Species lists here draw from Tennessee-Kentucky Plant Atlas records, the Tennessee Natural Heritage Program, Tennessee River Gorge Trust inventories, and iNaturalist observations from Marion County and its immediate neighbors. Where a species is regionally characteristic but has not been specifically documented in Marion, the prose notes that. The goal is a trustworthy working guide, not a claim of exhaustive coverage.

• Elevation range: ~630 ft (Tennessee River at South Pittsburg) to ~2,000 ft (Monteagle)
• Climate: humid subtropical (Köppen Cfa); 55–60 inches annual precipitation
• Bedrock: sandstone caprock on the plateau, limestone in the valley, mixed on gorge slopes
• Growing season: ~200 days in the valley, ~180 days on the plateau

Pines and conifers

Conifers in Marion County are a small but ecologically distinctive group. Eastern hemlock (Tsuga canadensis) is the signature tree of cool, shaded streamsides on the plateau and in the gorge. The hard-needled pines split by habitat: Virginia pine and shortleaf pine hold the dry sandstone caprock, eastern white pine appears on mesic gorge slopes and richer cove edges, and loblolly pine is mostly a planted timber tree. Eastern red-cedar is the calcium-loving juniper of cedar glades and limestone outcrops in the Sequatchie Valley. Bald cypress appears in Marion only as a planted ornamental: its native range on the Tennessee River reaches up to roughly the lower valley near Chattanooga, and the plateau and upper gorge sit outside that range.

Hemlock has been the visible casualty of the last two decades. The hemlock woolly adelgid (Adelges tsugae) has spread through Tennessee since the early 2000s, including into hemlock stands at South Cumberland State Park in Marion County, per the USDA Invasive Species Information Center HWA profile. Cottony white egg masses on the underside of hemlock branches are the diagnostic sign. Without chemical treatment or biocontrol, infested trees usually die within four to ten years. Coordinated treatment programs by state agencies and the Tennessee River Gorge Trust have kept some stands alive, but county-wide loss is ongoing.

Oaks

The dry ridge tops and plateau surface are dominated by an oak-hickory forest of white oak, chestnut oak, post oak, scarlet oak, black oak, and several hickory species. This is the forest type most visitors see along the Cumberland Trail and along Prentice Cooper's roads. The bottomland and slope members of the genus add another half-dozen oaks: shumard, cherrybark, willow, water, overcup, swamp chestnut, pin, and northern red oak all turn up on calcareous bottoms or rich slopes. Chestnut oak dominates the sandstone caprock from Prentice Cooper across to Foster Falls. White oak is the most recognizable upland oak: light gray loosely shaggy bark, deeply rounded leaf lobes without bristle tips, and acorns that germinate in the fall they drop. White oak was the preferred cooperage wood for Tennessee's whiskey-barrel industry, and its rot resistance made it the standard for fence rails in the 19th century. Mature white oaks live for several centuries and the largest plateau specimens on Prentice Cooper are correspondingly old.

Hickories and walnuts

The hickories share Marion's plateau and slope forests with the oaks. Shagbark hickory is the easiest to identify at a glance: long, loose, curling strips of bark give the tree a torn-up appearance even from a distance. The other hickories on dry ridges, mockernut, pignut, bitternut, red, and sand hickory, have tight rather than shaggy bark, and the species are distinguished mainly by leaflet number and nut shape. Three more hickories (pecan, shellbark, and the southern Carolina shagbark) live on better-drained bottoms or southern lowland edges. The walnuts share the family and habitat range: black walnut is a prized timber tree of rich coves and farm fencerows, and butternut is its rare, declining relative.

American chestnut and the blight legacy

Before 1904, one in every four canopy trees in Appalachian forests was an American chestnut, and Marion County's ridges carried chestnut at proportions that would be difficult to picture today. The chestnut blight, caused by the fungus Cryphonectria parasitica, arrived in New York in 1904, reached the Cumberland Plateau by the 1920s, and killed virtually every mature American chestnut on the southern plateau by the end of the 1930s. Range-wide the blight killed roughly 3.5 billion trees between 1910 and 1950, per the Wikipedia chestnut blight article. Oak-hickory associations replaced chestnut in the canopy and now account for roughly 85 percent of hardwood stands on the Tennessee Cumberland Plateau.

The species is not extinct. Shallow root systems of dead trees still send up stump sprouts that grow ten to twenty feet before the blight finds them again, and hikers on Prentice Cooper trails regularly encounter these sprouts. The American Chestnut Foundation has been working since the 1980s on backcross breeding, crossing American chestnut with blight-resistant Chinese chestnut and back-crossing the hybrids to recover American form. Tennessee is one of several states with TACF restoration test plots.

Cove-mesic canopy companions

The sheltered ravines, north-facing slopes, and cove bottoms on the Cumberland Plateau escarpment support one of the richest temperate forest types in North America, a mixed-mesophytic association sometimes called Cumberland Plateau cove plant community. Tulip poplar is the flagship canopy species. Per the Wikipedia article on Liriodendron tulipifera, Tennessee's General Assembly designated tulip poplar the official state tree by Public Chapter 204 of 1947, signed March 14, 1947. American beech and American basswood share the cove canopy and the upper subcanopy with tulip poplar, northern red oak (treated above with the oaks), sugar maple and yellow buckeye (treated below with the maples and buckeyes), and eastern hemlock (treated above with the conifers).

Maples and buckeyes

The maples split sharply by habitat. Sugar maple is a cove canopy species and pairs naturally with tulip poplar, beech, and northern red oak on rich slopes; its brilliant orange-red fall color is the signature autumn signal of cove forest. Red maple is the most abundant maple county-wide, ubiquitous from plateau ridges to floodplains. Silver maple sits in floodplains. Boxelder is the bottomland anomaly: a maple with compound leaves rather than the lobed simple leaves of its relatives. Striped maple is a small, cool-climate cove understory tree at the southern edge of its range. The buckeyes, in the same family (Sapindaceae), include yellow buckeye as the showy cove canopy species and red and painted buckeye as small understory trees.

Magnolias and other notable broadleaves

Marion's coves and lower slopes hold three native deciduous magnolias: cucumber magnolia is a canopy tree with greenish flowers; bigleaf magnolia has the largest simple leaves and largest flowers of any North American temperate tree; and umbrella magnolia has whorled leaves clustered at the branch tips that look like umbrellas. Southern magnolia, the evergreen species with large white flowers, is native to the Gulf Coastal Plain rather than Marion's plateau and gorge; locally it appears as a planted and sometimes naturalized yard tree. Sweetgum, blackgum, and water tupelo are grouped here for shared traits as broadleaf canopy or subcanopy trees with brilliant fall color.

Riparian and bottomland trees

Along the Sequatchie River, Battle Creek, the Little Sequatchie, and the small streams that drop off the plateau into the Tennessee River Gorge, a riparian forest of sycamore, river birch, black willow, silver maple, and eastern cottonwood lines the banks. American sycamore is the showcase species, with bark that peels in camouflage plates of white, cream, and pale green; large trees are easy to pick out from a distance on a winter ridgeline. The largest hardwood diameter in the eastern United States belongs to this tree. River birch has exfoliating salmon-pink bark; sweet birch is a cooler-slope species more often found on cove edges and rocky stream banks than on muddy lowlands, with twigs that smell strongly of wintergreen when broken. (Silver maple is treated above with the maples.)

Understory flowering trees

The understory of Marion's mid-elevation forests is layered with small flowering trees: the spring-blooming dogwoods and redbud, three native serviceberries, the muscle-trunked hornbeam and shreddy-barked ironwood, a cluster of native and orchard-escape plums and cherries, the famously difficult Crataegus hawthorns, four hollies (one evergreen and three deciduous), and a long tail of small-tree species that don't fit elsewhere.

Dogwoods and redbud

In April, the dogwood-and-redbud bloom overlap paints whole hillsides pink and white for about two weeks across the plateau and Sequatchie Valley. Flowering dogwood is the more familiar species; stiff dogwood is its smaller, swamp-edge cousin. Eastern redbud is the legume of the trio, leafless when its pink pea-flowers open along bare branches.

Serviceberries

Three native serviceberries bloom in late March and early April, often the first showy white flowers in the cove and ridge understory before any leaves have emerged. The genus is famously prone to hybridization; positive identification often requires multiple characters.

Hornbeams and ironwood

Two birch-family understory trees with similar names but distinct identification characters. Both produce hard, dense wood (the source of "ironwood" and "musclewood" common names) that early settlers used for tool handles, mallets, and ox yokes.

Plums and cherries

Plums and cherries (genus Prunus) cover a wide range of habitats, from native thicket species at woodland edges to orchard escapes naturalizing in old fields. The Cherokee cultivated chickasaw plum across the southeastern interior, including for trade. Black cherry is the only canopy-reaching member of the group; the others are small understory trees or large shrubs.

Hawthorns

The genus Crataegus is famously difficult to identify. Estimates of species number range widely depending on whether minor variations are treated as full species or as forms; the seven species below are the ones documented in Marion County by the regional plant atlases. Most have sharp thorns, white spring flowers, and small red pomes (haws) that persist into winter.

Hollies

Marion holds one evergreen and three deciduous hollies. The deciduous holly group ("possumhaw" and the like) confuses visitors who associate hollies only with their evergreen relatives.

Other small-tree understory

Small-tree species that don't fit the other understory groupings, including sourwood, sassafras, pawpaw, persimmon, and the limestone-bluff specialists yellowwood and American smoketree. Sourwood honey, harvested from Appalachian bee yards placed near sourwood stands, has been a cottage industry in Marion County for generations. Sassafras is the only local tree whose leaves come in three distinct shapes on the same branch: unlobed, mitten, and three-lobed "ghost." The roots were the original flavoring for root beer until safrole was banned from commercial food use in 1960.

Ash and elm

Two genera, two epidemics. Dutch elm disease, caused by the fungus Ophiostoma novo-ulmi (and its predecessor O. ulmi) and spread by elm bark beetles, arrived in the United States in 1928 and devastated American elm populations from the 1930s through the 1960s, per the Wikipedia article on Dutch elm disease. Marion's mature American elms were largely lost in the same window. Younger trees still grow back from seed and from older root systems but rarely reach the vase-shaped maturity that defined the species before the disease.

The emerald ash borer (Agrilus planipennis), a green wood-boring beetle from East Asia, was first detected in Tennessee at a Knox County truck stop on Interstate 40 in July 2010, per a Tennessee Department of Agriculture press release. By 2020 sixty-five Tennessee counties were under EAB quarantine, and the Tennessee Department of Agriculture estimated five million urban ash trees in Tennessee at two billion dollars at risk and 261 million ash trees on Tennessee timberland at nine billion dollars at risk. Most of Marion County's mature ash trees have died in the years since.

Other notable trees

A handful of native and naturalized trees that don't fit the previous groupings: the hackberries and sugarberry of bottomlands and limestone bluffs, the long-fenced hedge species osage orange and black locust, the catalpa with its big white-orchid flowers, honey locust, red mulberry, and the rare European alder buckthorn.

Invasive trees of concern

Four tree species that combine ecological aggressiveness with the ability to seed prolifically into Marion's fencerows, abandoned lots, and roadside thickets. The same species are framed alongside kudzu, Japanese honeysuckle, and other invasives in the "Invasive species and ecological threats" section further down the page; the cards below treat them as trees per se. Tree-of-heaven, mimosa, and princesstree are listed as severe-threat invasives by the Tennessee Invasive Plant Council.

Shrubs of the heath family: laurel, rhododendron, azalea, and blueberry

Where the plateau's caprock breaks down into thin acidic soils along bluff edges, a distinctive heath-family shrub community takes over. The acid-soil indicators of this group define the look of the rim trails: mountain laurel dominates from Foster Falls to the Cumberland Trail's gorge section, blooming in mid-May a week or two after flowering dogwood is done; rosebay rhododendron forms dense evergreen thickets along shaded plateau streams and blooms in late June and July; and the wild blueberries and azaleas stagger their flowering across April, May, and June so that some heath shrub is in bloom on the rim from the first redbud to the late-summer asters. Most visitors who time a hike to the rhododendron bloom are after the rosebay; serious wildflower watchers come earlier in the season for the azaleas and the laurel.

Witch-hazels and witch-alders

The witch-hazel family is a small but recognizable group on the plateau, including the only native shrub that flowers in November and a Cumberland-Plateau-edge species ranked Threatened in Tennessee.

Hazels

The native hazelnuts produce small but wildlife-important nuts at woodland edges. American hazelnut is widespread; beaked hazelnut is restricted to cooler higher-elevation slopes.

Viburnums, shrub-form dogwoods, and elderberries

Three closely related lineages of fruit-producing shrubs that share the niche of moist forest edges and stream margins. Viburnums, dogwoods, and elderberries are all in the order Dipsacales (with sambucus now placed in Viburnaceae); their fruits feed migrating thrushes and waxwings through fall.

Spicebush, sweetshrub, alder, and other forest-floor shrubs

A group of mostly native shrubs that share the moist understory niche, several with strong aromatic chemistry: northern spicebush smells of lemon-pepper, Carolina allspice of clove, and the bruised twigs of leatherwood are pungent enough that the early-spring flowers carry the smell some distance.

Sumacs and the poison-ivy relatives

The cashew family (Anacardiaceae) holds the regionally dominant sumacs and the urushiol-bearing poison plants that get taught with the rhyme "leaves of three, let it be." The trick is that several look-alikes are also three-leaved (fragrant sumac, box elder, young hickory shoots, even Virginia creeper at the seedling stage) and the rule produces false positives. Add the test that follows: poison-ivy and poison-oak have a longer stalk on the central leaflet than on the two side leaflets, smooth gray bark on older stems, and (poison-ivy only) hairy aerial roots if climbing. Poison sumac is wetland-restricted and looks nothing like the rhyme implies. Reactions to all four come from contact with urushiol, including from dead canes in winter.

Hydrangeas and mock-oranges

Two closely related groups of showy-flowered shrubs that share the rich-soil niche: hydrangeas with their flat or domed flower heads ringed by sterile florets, and mock-oranges with four-petaled white flowers that gave the cultivated landscape mock-orange its name. Several of the mock-oranges are limestone-bluff specialists in Marion County, restricted to the gorge slopes.

Buckthorns, hollies, and limestone-bluff specialists

A grouping of native fruit-producing shrubs, several of which prefer the limestone-derived soils of the gorge slopes and Sequatchie Valley.

St. John's-worts

The shrubby Hypericums on the plateau range from very small subshrubs (St. Andrew's cross) to chest-high flowering shrubs (shrubby St. John's-wort). All have bright yellow flowers with prominent stamen tufts and several have a tendency to dominate poor-soil sites where larger shrubs cannot thrive.

Brambles and roses

The thorn-bearing native blackberries, raspberries, and roses share old-field and forest-edge habitat. Identification within Rubus is notoriously difficult; the segregate species are largely a matter of cane shape, leaf number, glandular hairs, and flowering time, and most field workers settle for "blackberry" or "dewberry" as a working group name.

Serviceberries and chokeberries (Rosaceae)

The shrub-form serviceberries and the chokeberries (genus Aronia) are closely related Rosaceae shrubs with white five-petaled flowers in spring and persistent fruits in fall. The chokeberries hybridize freely; the purple chokeberry is the natural hybrid between the red and black species.

Native bush honeysuckles and coralberry

The native bush honeysuckles in genus Diervilla and the climbing-low Lonicera dioica are completely distinct from the invasive Asian Lonicera shrubs (L. maackii, L. morrowii) that dominate the invasive-shrub section below. Coralberry (genus Symphoricarpos) is a separate Caprifoliaceae shrub with persistent pink fruits.

Other notable native shrubs

A miscellaneous gathering of native shrubs that do not fit the larger groupings above: a creeping sub-shrub of cove-hardwood floors, two prickly pear cacti of limestone glades, a parasitic shrub that lives in oak canopies, and a set of stream-bank willows.

Invasive shrubs of concern

Twenty-one non-native shrubs are documented as either established in Marion County or persisting from old plantings. Several are TN-IPC-listed severe-threat invasives that aggressively displace native shrubs in floodplain and disturbed-edge habitats; others are old-fashioned ornamentals that persist at abandoned home sites without spreading aggressively. The full ecological-threat context for invasive plants is in the Invasive species and ecological threats section below.

Native climbing vines

Marion County's native woody vines (lianas) climb by twining stems, tendrils, sucker-tipped tendrils, or aerial roots. Most are non-aggressive and do not damage their host trees the way the invasive Asian climbers below tend to. Several are showy-flowered enough to be planted as native alternatives to invasive climbers (American wisteria for the Asian wisterias; trumpet honeysuckle for Japanese honeysuckle).

Eastern poison-ivy

Eastern poison-ivy gets its own subsection because the safety-information stakes are higher than for any other native vine on the page, and because its growth habit straddles ground-cover, shrub, and climber forms in the same population. The "leaves of three, let it be" rhyme works as a first-pass filter, but several non-toxic look-alikes (Virginia creeper, fragrant sumac, box elder seedlings) are also three-leaved. The reliable supplementary tests: the central leaflet sits on a longer stalk than the two side leaflets; older climbing stems have hairy aerial roots gripping the bark; and the fall fruits are matte waxy white in clusters. Urushiol is present in all parts of the plant year-round, including in dead winter canes.

Greenbriers

The thorny climbing greenbriers are a familiar plateau-bushwhack obstacle. All are evergreen-leaved and have stout straight thorns; field separation among the three Marion County species rests on leaf shape and prickle character.

Native grapes

Five native grape species are documented in Marion County by the TN-KY Plant Atlas. All are real grapes (genus Vitis); separating species in the field rests on tendril branching, leaf lobe pattern, and bark behavior on older stems.

Invasive vines of concern

Seven non-native woody vines are documented in Marion County. Three are TN-IPC severe-threat invasives that are reshaping forest understory and edge ecosystems; the others are persistent-but-less-aggressive garden escapes. The full invasive-plant context is in the Invasive species and ecological threats section.

Wildflowers and woodland forbs

Marion County's wildflower flora, the herbaceous broadleaved forbs, runs to several hundred species across the cove forest, oak-hickory slope, sandstone rim, limestone bluff, river floodplain, and open meadow. The card grid below catalogs the spring-ephemeral and woodland-forb portion: species whose primary habitat is the deciduous-forest understory, from late February openers like bloodroot and the hepaticas through the late-summer cove asters and goldenrods. Open-country, glade, and riparian forbs are filed separately further down the page.

From late February through early May, before the canopy closes, a short-lived wildflower display covers the floor of cove hardwood forests and protected north-facing slopes. The spring ephemerals (bloodroot, the trilliums, Dutchman's breeches, the trout lilies, the toothworts, the spring beauties, and the hepaticas) complete their entire above-ground life cycle in about six weeks. They flower, set seed, and die back before the trees overhead finish leafing out, trading a narrow window of sun for the advantage of going dormant through the dry summer. Most produce ant-dispersed seeds with an oil-rich elaiosome that ants carry into their underground nests, depositing the seeds in nutrient-rich tunnel debris.

The Cumberland Plateau's trillium diversity is one of the floristic signatures of the southern Appalachian region. Eight species are documented in or expected for Marion County, more than the entire flora of most western states. The plateau's deep, intact cove soils, its base-rich limestone exposures along the Tennessee River Gorge, and its long history of light human disturbance combine to support the high count.

Trilliums

Eastern North America has more trillium species than any other continent, and the southern Cumberland Plateau holds one of the richest concentrations on the continent. Eight species are documented in or expected for Marion County, ranging from the abundant sessile-flowered Trillium cuneatum on every cove slope to the rare twisted trillium known from a handful of southern Tennessee bluffscapes. All trilliums share the same three-leaved, three-petaled architecture, but they split into two clades by flower attachment: pedicellate trilliums hold the flower above the leaves on a short stalk, and sessile trilliums plant the flower directly on the leaf whorl. Both clades are slow growers; a seed takes seven to ten years to reach flowering age, and a colony measured in feet may be many decades old. Browsing white-tailed deer can wipe out a local patch in a season, which is one reason trillium populations are concentrated in protected areas like Prentice Cooper State Forest and the Foster Falls escarpment rather than along browsed roadsides.

Lilies, bellworts, and trout lilies

The lily-allied monocots of the woodland floor follow a similar architecture to trilliums: parallel-veined leaves, three-merous flowers, and bulbs or rhizomes that store energy through the dry summer dormancy. Trout lilies and Solomon's seal allies sit alongside the true lilies in this group; orchids and iris are filed elsewhere on the page. Bellworts (Uvularia) and yellow mandarin (Prosartes) hold the same drooping yellow-bell flower architecture in early spring; the differences come down to leaf attachment and stem branching. Indian cucumber root (Medeola) breaks the pattern with two whorls of leaves stacked on a single stem, the lower whorl wider and the upper whorl smaller.

Bloodroot, mayapple, and the woodland poppies

The Papaveraceae and the closely allied Berberidaceae contribute three of the most recognizable woodland forbs on the Cumberland Plateau: bloodroot, with its red rhizome sap; the celandine poppy, with deeply lobed leaves and four-petaled yellow flowers; and mayapple, technically a barberry-family plant but conventionally grouped here with the early-spring cove forbs. Toxic alkaloids dominate the chemistry of all three; bloodroot's sanguinarine, mayapple's podophyllotoxin (the precursor to the chemotherapy drug etoposide), and the celandine poppy's chelidonine are the reason livestock and most insects leave them alone.

Dutchman's breeches and squirrel corn

The two Dicentra species of the cove forest are easy to confuse from leaf alone: both have finely divided ferny foliage that emerges in early April and fades by late May. But the flower architecture is unmistakable once they bloom. Both are now placed in the poppy family Papaveraceae (formerly the bleeding-heart family Fumariaceae), and both produce ant-dispersed seeds with an oil-rich elaiosome that ants carry into their underground nests, depositing the seeds in nutrient-rich tunnel debris.

Toothworts and the early-spring mustards

Toothworts (Cardamine, formerly Dentaria) are members of the mustard family that bloom in early to mid-April under the still-bare canopy. The four white petals arranged in a cross are the family signature; the species split out by leaf shape, with cutleaf toothwort holding three deeply lobed leaflets in a single whorl, slender toothwort holding paired three-leaflet basal leaves, and broadleaf toothwort holding wider, less deeply lobed leaflets. All four Marion toothworts are native and most are confirmed in the county Atlas record.

Yellow harlequin

Corydalis are mustard-family relatives in the poppy family with delicate ferny foliage and four-petaled flowers ending in a single backward spur. They sit between the toothworts and the Dicentras both ecologically and evolutionarily.

Virginia bluebells and the woodland borages

The Boraginaceae contributes Virginia bluebells (Mertensia virginica), the showiest of the Marion floodplain spring ephemerals, plus the much more modest Virginia stickseed (Hackelia virginiana) of disturbed cove edges and old logging roads. Both share the family signature of bristly stems and a five-lobed corolla; the bluebells dominate ground cover in floodplain pockets while the stickseed slips by unnoticed until its barbed seeds catch on socks.

Phlox, foamflower, shooting star, and alumroot

Five mid-spring forbs that share the rich-soil understory of the cove and shaded slope. Woodland phlox (Phlox divaricata) and creeping phlox (Phlox stolonifera) put down sheets of pale-blue flowers in April and early May; foamflower's spike of small white flowers earns the genus name Tiarella, the diminutive of the Greek for crown; shooting star's strongly reflexed petals make it look like a comet; and alumroot's tall flowering stalk over a basal rosette of mottled leaves rounds out the group. All five are reliable garden plants in addition to wild presences in Marion coves.

Wild ginger and heartleaf

The Aristolochiaceae includes two contrasting woodland forbs in Marion: northern wild ginger (Asarum canadense) with deciduous, kidney-shaped leaves, and the southern Appalachian heartleafs (Hexastylis) with thick evergreen leaves. Both hide their fleshy maroon flowers at ground level under the leaves, where carrion flies and beetles pollinate them. The aromatic rhizomes of Asarum have a true ginger scent and were used as a substitute for tropical ginger by indigenous peoples and early settlers, although the plant contains aristolochic acids that are toxic in quantity and should not be eaten today.

Cohoshes, baneberries, columbine, and the woodland buttercups

The Ranunculaceae and the closely related Berberidaceae produce a long roster of woodland forbs in Marion, ranging from the giant flowering candelabras of black cohosh (Actaea racemosa) to the modest white anemones and the early-summer columbines on rocky bluffs. All share the family pattern of distinct (not fused) flower parts and a tendency toward toxic alkaloids, but the architecture varies wildly: some species hold compound leaves above the flowering stem, others basal rosettes, and the columbines have leaves divided into nine identical lobes. Goldenseal (Hydrastis canadensis), grouped here for ecological reasons rather than strict taxonomy, is one of the few state-tracked forbs in the group.

Spring beauty, hepatica, and rue anemone

Three of the earliest-blooming small forbs of the cove and oak-hickory floor. Spring beauty (Claytonia) sometimes opens in late February. Hepatica (Anemone, formerly Hepatica) holds three-lobed evergreen leaves through winter and flowers in March before the new leaves emerge. Rue anemone (Thalictrum thalictroides) follows a few weeks later. None is a true cove specialist; all three appear on plateau slopes, oak-hickory rises, and limestone-influenced ground.

Solomon's seal, false Solomon's seal, and yellow mandarin

The arching leafy stems of Polygonatum (true Solomon's seal), Maianthemum (false Solomon's seal), and Prosartes (yellow mandarin) are a defining feature of the cove understory through summer. The four species split out by flower placement: Polygonatum hangs paired greenish-white tubular flowers along the underside of the arching stem; Maianthemum holds a terminal cluster of small white flowers at the stem tip; Prosartes hangs paired greenish-yellow bells from a forked stem. All four are members of the lily-allied monocots and produce dark-blue or red berries in late summer.

Wood violets

Marion County's woodland violets split into a blue-flowered group with heart-shaped leaves (V. sororia, V. cucullata, V. striata) and a yellow-flowered group of cove and slope specialists (V. pubescens, V. rotundifolia, V. hastata), plus the bird's-foot violet (V. pedata) of dry, sandy openings and the white-flowered V. blanda and V. canadensis of mesic cove pockets. Most violets produce two kinds of flowers: showy chasmogamous flowers in spring that depend on insect pollinators, and self-pollinating cleistogamous flowers later in the season that never open and produce most of the year's seed crop. The dual strategy is one reason violet populations are so resilient.

Mid-summer and late-summer woodland forbs

By July the spring ephemerals have set seed and gone dormant, and a different set of woodland forbs takes over the cove and slope understory. Most are taller, leafier, and longer-blooming than the spring species; they rely on insect pollinators that are active through summer rather than the early bumblebees that work the cove in April. Yellow jewelweed (Impatiens pallida), white snakeroot (Ageratina altissima), and the woodland sunflowers and asters dominate the late-summer cove floor; the goldenrods of the deep woods are easy to overlook because they don't hold the bright field-edge yellows of their open-country cousins.

Galax, spotted wintergreen, and the saprophytes

The Ericaceae and the closely allied Pyrolaceae and Monotropaceae produce a small but distinctive set of woodland forbs adapted to nutrient-poor, fungus-rich plateau soils. Galax (Galax urceolata) and spotted wintergreen (Chimaphila maculata) are evergreen rosette plants that depend on mycorrhizal associations with soil fungi. Indian pipe (Monotropa uniflora) and pinesap (Hypopitys monotropa) take the strategy a step further: they have lost chlorophyll entirely and steal sugars from photosynthetic trees through shared fungal networks. All four are reliable indicators of mature, undisturbed forest soils on the southern Plateau.

Bluets, partridgeberry, miterwort, and chickweed

A miscellany of small woodland forbs that don't fit neatly into the larger subgroups but share a low-stature, ground-cover habit. Bluets, partridgeberry, and miterwort are common in cove forest at every elevation; star chickweed is the woodland representative of a genus more familiar from gardens and open country.

Other woodland forbs

A final set of woodland forbs that fill out the seasonal cycle without fitting cleanly into the family-based subgroups. Most are common, widespread, and easy to overlook in passing; together they round out the cove and slope understory through every month of the growing season.

Fire pink and the rocky-rim wildflowers

Open rocky woods along the plateau edge and limestone-influenced slopes host a small set of forbs that don't neatly group with either the cove-floor wildflowers or the limestone-bluff specialists below. Fire pink (Silene virginica) is the headline species, a hummingbird-pollinated red flower of thin-soiled openings. Most of these species also appear at lower density in cove and slope habitats, but the rocky-rim openings are where they reach peak abundance.

The wildflower groups below leave the cove and slope understory and pick up the open-country meadow, the limestone-bluffscape glade, and the streambank and wetland-edge habitats. They include Tennessee's state wildflower (passionflower), several federally and state-listed plants, and a long list of common roadside and field species that anyone living in Marion will already know on sight. Bloom periods stretch from April (the lyre-leaf sage and partridge pea pioneers) through October (the late asters and bottle gentian).

Milkweeds and the dogbane allies

Marion's milkweeds (Asclepias) are the host plants of monarch butterflies and a long list of other specialist insects. Eight Asclepias species and the closely related Indian-hemp (Apocynum cannabinum) cover habitats from full-sun roadside cuts to wet meadows to glade openings. Look for the rounded umbel flower clusters of the field species and the narrow whorled leaves of the glade specialists.

Goldenrods of field and roadside

Goldenrods (Solidago) are the dominant late-summer composites of Marion's open country. Roughly a dozen species occur in the county; the seven below are the most reliable in roadside, old-field, and dry-meadow habitats. Goldenrod is insect-pollinated and is not the cause of hay fever, which comes from the wind-pollinated ragweeds (Ambrosia) blooming at the same time.

Open-country asters

The asters (Symphyotrichum and segregate genera) bloom in waves through late summer and autumn. The five species below are the most commonly encountered in Marion's old fields and roadside cuts; the cove-forest white wood aster and heart-leaved aster are filed under the woodland forb subgroups above.

Coneflowers, sunflowers, and the open-country composites

The big yellow composites of Marion's roadsides and field edges. Black-eyed Susan and the brown-eyed cousin are the most familiar; the woodland sunflower (already filed under woodland forbs) is the small-flowered shaded relative of the field sunflowers below. The Helianthus complex hybridizes where habitats overlap, so close-leaf inspection is needed to separate them in the field.

Joe-Pye-weeds, bonesets, and ironweed

The Joe-Pye-weeds (Eutrochium) and bonesets (Eupatorium) are the late-summer giants of Marion's wet meadows and ditch margins. Botanists split them out of Eupatorium in the early 2000s, so older Marion field guides still list them all under that genus. Giant ironweed (Vernonia gigantea), in the same composite tribe, is included here as a fellow tall, late-blooming wet-meadow species.

Tickseeds and blazing stars

The tickseeds (Coreopsis) are bright yellow rays of dry meadows and roadside cuts; the blazing stars (Liatris) are upright purple spikes that open from the top down. Both genera are well-represented in Tennessee's roadside-seeding programs and supply much of the yellow and purple of Marion's mid-summer roadside palette.

Mints, mountain mints, and the bee balms

Marion's mint family (Lamiaceae) is anchored by wild bergamot, the mountain mints, and the lyre-leaf sage of dry openings. All have squared stems, opposite leaves, and tubular two-lipped flowers, and all support a long list of native bees, wasps, and butterflies. Pollinator surveys consistently rank the mountain mints (Pycnanthemum) among the most-visited native genera in eastern North America.

Beardtongues and vervains

The beardtongues (Penstemon) and vervains (Verbena) are paired here as small-flowered upright forbs of dry meadows and roadside cuts. The beardtongues take their common name from a tuft of hairs on the lower lip of their tubular flowers that helps direct visiting bees toward the pollen.

Fleabanes, thistles, pussytoes, and ragworts

A grouping of small-headed composites and the spiny thistles. The native thistles below are not the same as the introduced bull and Canada thistles; native species are important pollinator plants for bumblebees and swallowtail butterflies and a critical food source for goldfinches. The two ragworts (Packera) below were until recently filed in the genus Senecio; older field guides still use the older name.

Passionflower, evening primroses, and other field forbs

A grouping of the headline open-country forbs that don't fit cleanly into the larger family groups. Passionflower is Tennessee's official state wildflower; the evening primroses are largely night-blooming moth-pollinated specialists with one exception (the day-blooming sundrops); partridge pea is a roadside legume that fixes nitrogen and stabilizes soil in disturbed cuts.

Gentians and rose pinks

The gentian family is sparsely represented in Marion but worth a careful look. Both bottle gentian and striped gentian have flowers that never open fully and rely on bumblebee force-pollination; rose pink (Sabatia) is the showy gentian-family member of summer roadsides.

Limestone bluffs on the Tennessee River Gorge slopes and in the Sequatchie Valley, plus the cedar glades and sandstone caprock openings of the plateau itself, support flora distinct from both the cove forest and the open meadows. The cards below cover the headline native species of those rocky openings; the walking-fern-and-friends complement of the limestone bluffscape lives with the ferns under Session 6 of this expansion.

Large-flowered skullcap and the limestone-bluff mints

Limestone bluffs on the Tennessee River Gorge slopes and in the Sequatchie Valley support a flora distinct from the acidic plateau caprock. The most signal species is large-flowered skullcap (Scutellaria montana), a federally threatened mint endemic to the Tennessee, Georgia, and Alabama border country; Marion's gorge holds one of its largest known populations. The bluff-loving heart-leaf skullcap is the Sequatchie Valley counterpart on calcareous slopes.

Rosinweeds, alumroots, and the glade composites

The cedar glade and limestone-bluffscape openings of Marion (and the broader southern Cumberland Plateau) support a small but distinctive flora that is found almost nowhere else. Cumberland rosinweed (Silphium brachiatum) is endemic to the Cumberland Plateau region of Tennessee, Alabama, and Georgia; small-flower alumroot (Heuchera parviflora) is a vertical-bluff specialist; Maryland golden-aster is the headline yellow of the dry sandstone caprock openings.

Marion's riparian and wetland-margin flora threads the Sequatchie River bottomlands, the small streams that drop off the plateau into the Tennessee River Gorge, the Nickajack Lake coves, and the beaver ponds and seep meadows of the cove drainages. Cardinal flower's vivid red lights up the August streamside; the lobelias, monkey-flowers, and turtleheads form a connected complex of two-lipped bumblebee-pollinated forbs; and the emergent aquatics anchor the still-water margins.

Cardinal flower and the lobelias

The lobelias (Lobelia) split the wet-meadow palette between hummingbird-pollinated red (cardinal flower, already cardded under the rocky-rim subgroup above) and bumblebee-pollinated blue (great blue lobelia). Cardinal flower's bloom in August and September coincides with peak ruby-throated hummingbird abundance in southern Tennessee; the tubular flower is too narrow for most bees and is built for hovering hummingbird beaks. Indian tobacco is the small annual roadside lobelia, easily overlooked but common.

Monkey-flowers and turtleheads

Three flowers grouped here for their two-lipped tubular structure: the monkey-flowers (Mimulus) and white turtlehead (Chelone). All three depend on bumblebee pollination, with the bee forcing its way into the closed flower lips. White turtlehead is the larval host for the Baltimore checkerspot butterfly, a rare colonial species at the southern edge of its range in southern Tennessee.

Lizard's tail, water willow, and the wetland-edge forbs

The wetland-edge specialists of Marion's stream margins, beaver-pond shores, and Tennessee River sloughs. American water willow forms dense streambed colonies along the rocky-bottomed reaches of the Sequatchie and Battle Creek; lizard's tail tolerates more standing water; eastern rose mallow holds the title of Marion's largest native flower. Butterweed sheets entire bottomland fields yellow in early April.

Pickerelweed, arrowheads, and emergent aquatics

The emergent aquatics of Marion's still-water margins (Nickajack Lake coves, beaver ponds, slough edges, slow stretches of the Sequatchie). Pickerelweed and the arrowheads (Sagittaria) provide cover for fish fry and amphibians and stabilize muddy substrates. Duck-potato's starchy tubers were a staple food for many Indigenous peoples of eastern North America.

Swamp sunflower, bluestar, and other wetland forbs

A short grouping of late-blooming and early-blooming wetland forbs: swamp sunflower carries the September-October yellow that the field sunflowers don't reach into wet meadows; eastern bluestar provides the May blue of bottomland creek margins; swamp smartweed handles the slow-water edges through summer and autumn.

Limestone bluffs, ledges, and the endemic bluffscape

Limestone bluffs on the Tennessee River Gorge slopes and in the Sequatchie Valley support a flora distinct from the acidic plateau caprock. Calcium-loving species thrive on the calcareous ledges and seep walls, including the federally threatened large-flowered skullcap (Scutellaria montana), the Cumberland Plateau-endemic Cumberland rosinweed (Silphium brachiatum), and a long roster of forbs and ferns adapted to vertical and near-vertical rock faces. The headline mints, rosinweeds, and saxifrages of the bluffscape are cardded under the Wildflowers and woodland forbs H2 above; the bluff-loving ferns (walking fern, ebony spleenwort, and their friends) are cardded under Spleenworts and the limestone-bluff ferns in the fern roster below. Large-flowered skullcap is treated in greater detail on the endemic and notable species page.

Wetlands and riparian woods

Along the Sequatchie River, Battle Creek, the Little Sequatchie, and the small streams that drop off the plateau into the Tennessee River Gorge, a riparian forest of sycamore (Platanus occidentalis), river birch (Betula nigra), black willow (Salix nigra), and silver maple (Acer saccharinum) lines the banks. Sycamore bark peels in camouflage plates of white, cream, and pale green; large trees are easy to pick out from a distance on a winter ridgeline.

The wet-meadow and stream-margin forb community of cardinal flower, great blue lobelia, jewelweeds, monkey-flowers, turtleheads, water willow, and lizard's tail is cardded under the Wildflowers and woodland forbs H2 above. The emergent aquatics of the still-water margins (pickerelweed, the arrowheads, broadleaf cattail) are in the same H2 under Pickerelweed, arrowheads, and emergent aquatics.

A note on bald cypress (Taxodium distichum): the historical native range of bald cypress on the Tennessee River reaches only to the lower valley near Chattanooga or below. Where it appears in Marion County today it is a planted tree, not native flora. Sources vary on the exact northern limit of its native range, but the plateau and upper gorge are generally considered outside it.

Ferns, lycophytes, and horsetails of the plateau and gorge

Marion County's pteridophyte flora is rich for the latitude, with roughly fifty native ferns and fern allies (lycophytes and horsetails) documented across the cove hardwood forest, the acidic sandstone caprock, the calcareous limestone bluffs of the Tennessee River Gorge, and the wet seeps and stream margins that thread through both. The vascular ferns reproduce by alternation of two free-living generations: the familiar leafy "sporophyte" plant produces spores that grow into a tiny, often microscopic, free-living "gametophyte," which in turn produces the egg and sperm that fuse to become the next sporophyte. Almost every Marion fern below is identified at the sporophyte stage; the gametophyte is rarely seen by anyone but specialists.

The cove-floor ferns (Christmas fern, the wood ferns, the lady ferns, maidenhair, and the beech ferns) are reliable indicators of rich, mesic, near-neutral soil and are used as marker species in regional vegetation classifications. The limestone-bluff ferns (walking fern, the calcareous spleenworts, hart's-tongue, bristle fern, southern maidenhair, purple cliffbrake) hold the calcareous bluffs of the Tennessee River Gorge and the Sequatchie Valley slopes; the acid-rock ferns (mountain spleenwort, lobed and Bradley's spleenworts, the lip ferns, rock polypody) hold the sandstone caprock and the dry plateau outcrops. Wet ground holds the cinnamon and royal ferns, the sensitive fern, the chain ferns, and the climbing fern. The clubmosses, spikemosses, and horsetails are scattered through the cove-floor and stream-margin communities and are often missed by visitors who look only for "ferns."

Walking fern is the headliner of the limestone bluffscape and a useful symbol of how Marion's fern flora fits the underlying geology: the calcareous limestone of the gorge and the acid sandstone of the caprock hold completely different fern communities, with very little overlap, separated sometimes by less than a few hundred vertical feet of rock. The cards below are arranged by family and morphology rather than habitat, but the habitat tags in each Status line let visitors cross-reference back to a specific terrain on the ground.

Wood ferns, shield ferns, and bladder ferns

The Dryopteridaceae, Cystopteridaceae, and allied families dominate the cove-floor fern guild. Most are tuft-forming evergreens or winter-deciduous clump ferns of rich, mesic forest. The wood ferns (Dryopteris) and shield ferns (Polystichum) are the easiest to identify, with bipinnate fronds and prominent round sori; the bladder ferns (Cystopteris) and cliff ferns (Woodsia) are smaller, more delicate, and favor rocky habitats. Christmas fern is by far the most abundant fern in Marion County and the easiest to identify in January woods.

Lady fern and silvery glade fern

Two large, deciduous ferns of rich cove floors with finely divided, lacy fronds. Both belong to the Athyriaceae and were historically grouped under Athyrium. They are the bright-green fern silhouettes most visible on a cove slope in midsummer.

Sensitive fern and the chain ferns

Three ferns of wet ground, all with distinctive dimorphic fronds (separate fertile and sterile fronds with very different shapes). The sensitive fern is named for how quickly the fronds collapse after the first frost. The chain ferns get their name from the chain-like rows of sori arranged along the veins.

Spleenworts and the limestone-bluff ferns

The genus Asplenium reaches its richest diversity in the Marion-county-area Cumberland Plateau and Tennessee River Gorge, where calcareous limestone bluffs, sandstone overhangs, and shaded rock faces support a dozen-plus species and natural hybrids in a small space. Walking fern (Asplenium rhizophyllum) is the headliner of the limestone bluffscape: it puts down roots wherever the tip of an arching frond touches mossy limestone, producing daughter plants that, over many seasons, "walk" the colony across a ledge face. The other spleenworts split cleanly along rock chemistry, with mountain spleenwort and lobed spleenwort holding the acid sandstone outcrops and walking fern, black-stem spleenwort, and Bradley's spleenwort holding the calcareous limestone. The federally threatened hart's-tongue fern reaches its only southern Appalachian foothold in deep limestone sinkholes nearby. Two other limestone-bluff specialists, the Appalachian bristle fern and the gametophyte-only Appalachian shoestring fern, join the spleenworts in this group.

Cinnamon and royal ferns

The Osmundaceae are a small, ancient fern family with a fossil record reaching back into the Permian. Two species occur in Marion. Both are tall, deciduous, and tied to wet ground: seepy hollows, stream margins, and the wet edges of plateau heath. Both bear separate fertile fronds or fertile pinnae rather than sori on the underside of the regular leaf.

Hay-scented and bracken

Two large, deciduous ferns of the Dennstaedtiaceae that form colonies rather than discrete crowns. Both spread aggressively by rhizome and can dominate large areas of dry-mesic forest after a disturbance.

Maidenhair, lip ferns, and cliffbrakes

The Pteridaceae are the rock-face specialists. Most are small, drought-tolerant, with leathery or hairy fronds adapted to the seasonally-dry surfaces of sandstone caprock, limestone outcrop, and shaded ledge. The maidenhair ferns (Adiantum) are the exception: they hold more delicate fronds in shaded mesic seeps and cove floors.

Polypody ferns

Small evergreen ferns with simple pinnatifid fronds (deeply lobed but not fully divided) on creeping rhizomes. Rock polypody and Appalachian polypody form mossy mats on shaded sandstone boulders; resurrection fern grows as an epiphyte on hardwood bark and survives long dry spells by curling up tightly until the next rain.

Beech ferns and New York fern

Two delicate, deciduous ferns of acid cove floors, plateau slopes, and shaded glade margins. Both are members of the Thelypteridaceae and have a soft, lacy frond texture that distinguishes them from the leathery wood ferns.

The climbing fern

One of the most unusual ferns of the eastern United States: a true climbing fern with a twining rachis that winds up through shrubs and small trees. Its only North American representative is the species below, restricted to acid woodland margins on the Cumberland Plateau and Coastal Plain.

Grape ferns, rattlesnake fern, and adder's-tongues

The Ophioglossaceae are the most ancient lineage of living vascular plants, with a fossil record reaching back into the Devonian. Each plant produces a single combined leaf that splits into a sterile lower segment (the "leaf") and a fertile upper spike or panicle (the "fruit"). The grape ferns and rattlesnake fern carry a paniculate fertile spike with grape-like clusters of sporangia; the adder's-tongues carry a single linear spike.

Clubmosses and spikemosses

The lycophytes are the oldest still-living lineage of vascular land plants, branching off the main vascular-plant evolutionary trunk in the Silurian. Marion supports five species across three families. All are small, evergreen, and bear sporangia in distinct cones ("strobili") at the tips of fertile shoots. Older taxonomies lumped most of them in Lycopodium; current treatments split the genus.

Horsetails and scouring rushes

Equisetum is the only surviving genus of a once-diverse plant lineage (Equisetales) that dominated late Paleozoic swamps. Two species occur in Marion. Both have hollow, jointed, silica-rich stems with whorls of tiny scale-like leaves at each node, an unmistakable architecture.

Mosses, liverworts, and the plateau bryophyte community

Beneath the ferns sits a layer the casual visitor rarely notices but that ecologists call out as one of the southern Cumberland Plateau's most species-rich communities: the bryophytes. Mosses, liverworts, and a few hornworts cover the back walls of every shaded rockhouse, the bark of every cove hardwood, the upper surface of every rotting log on a cove floor, and the seeps and stream banks of every plateau gorge head. The Cumberland Plateau and adjacent Tennessee Cumberlands are recognized in regional bryological surveys as a North American hotspot for non-vascular plant diversity, with the deep shaded gorges providing the cool, humid microclimates these species need.

A comprehensive bryophyte inventory for Marion alone would run to several hundred species and is beyond the scope of a general-audience reference. The cards below introduce the five most visitor-recognizable taxa visitors are likely to see on a typical hike: the tall haircap moss of acid plateau caprock, the cushion-forming pincushion moss, the peat-forming sphagnum of the few plateau bogs, the snakeskin-textured thalloid liverwort of seep walls, and the tree-shaped American tree moss of stream banks. Anyone who wants to go deeper can use these as a gateway into the regional bryological literature.

Orchids

Marion County's woods host at least seventeen native orchid species, all protected under Tennessee law. Orchids rely on specific mycorrhizal fungi for germination and establishment; nearly all require years to decades to reach flowering size from seed. Digging a wild orchid almost always kills the plant because the root-fungus symbiosis cannot survive transplantation. Tennessee law prohibits collecting any native orchid from public or private land without a permit. If you find one, photograph it and leave it where it grows.

Slipper orchids

Ladies'-tresses and rattlesnake plantains

Woodland orchids

Fringed orchids

Other notable monocots

Beyond orchids, grasses, sedges, and the spring wildflowers treated above (trilliums, bellworts, trout lilies, Solomon's seals), Marion County supports dozens of monocot species across a range of families. The arums, irises, spiderworts, wild lilies, and climbing monocots below round out the county's non-grass monocot diversity.

Arums and woodland monocots

Native lilies and allies

Irises and blue-eyed grasses

Spiderworts and dayflowers

Other notable monocots

Grasses, sedges, and rushes

Marion County's grasslands, forest floors, wetlands, and roadsides support nearly three hundred species in the grass family (Poaceae), sedge family (Cyperaceae), and rush family (Juncaceae). These graminoids form the structural backbone of every open and semi-open habitat in the county: broomsedge colors abandoned pastures copper in autumn, woodland sedges carpet the cove-hardwood understory, and soft rush rings every farm pond and roadside ditch. The cards below highlight the ecologically distinctive, conservation-listed, and visitor-recognizable species. The roughly two hundred additional graminoid species documented for the county are catalogued in the TN-KY Plant Atlas Marion County records.

River cane (Arundinaria gigantea), the county's most historically significant grass, has its own dedicated section below: River cane and canebrakes.

Native bamboos (cane)

Three species of Arundinaria, the only bamboos native to North America, are documented in Marion County. Giant cane is treated in the River cane and canebrakes section below. The two smaller species, hill cane and switch cane, occupy different habitats and are less well known.

Tallgrass prairie remnants

Before European settlement, scattered openings on the Cumberland Plateau and Sequatchie Valley floor supported tallgrass prairie species now more associated with the Great Plains. These warm-season bunch grasses persist in Marion County on thin-soiled limestone glades, powerline rights-of-way, and roadside remnants where fire or mowing prevents woody encroachment. Little bluestem and indiangrass are the most visible; big bluestem and switchgrass occur in smaller pockets.

Broomsedge and old-field grasses

When a Marion County pasture goes fallow, broomsedge is typically the first native grass to reclaim it. These warm-season bunch grasses dominate the abandoned-pasture succession stage between bare ground and woody encroachment, turning whole hillsides orange-bronze in autumn and winter.

Cool-season pasture and lawn grasses

The most common grasses in Marion County by acreage are not native. European cool-season grasses, introduced for pasture and hay, dominate the valley floors and lower slopes. Tall fescue alone probably covers more Marion County ground than any single native species. These grasses are green in spring and fall, brown and dormant in summer heat, the opposite cycle of the native warm-season grasses above.

Woodland grasses

Several native grasses are adapted to the shaded understory of Marion County's cove-hardwood and mesic forests. These shade-tolerant species are less conspicuous than the open-field grasses but ecologically important as ground cover in undisturbed forest.

Woodland sedges

The genus Carex is the largest plant genus in Marion County, with at least seventy species documented in the TN-KY Plant Atlas. Sedges are distinguished from grasses by their triangular stems (the mnemonic "sedges have edges") and from rushes by their three-ranked leaves and lack of a visible flower. Most are small, inconspicuous plants of the forest floor, but together they form a critical component of the cove-hardwood understory. The cards below highlight a representative subset; the full Carex roster is catalogued in the TN-KY Plant Atlas Marion County records.

Wetland sedges and rushes

Every farm pond, roadside ditch, and stream margin in Marion County supports a community of wetland-obligate sedges and rushes. These species stabilize saturated soils, filter runoff, and provide cover for amphibians and invertebrates.

Conservation-listed graminoids

Several grasses, sedges, and rushes in Marion County carry state conservation listings from the TDEC 2025 Rare Plant List. These species are typically restricted to specific microhabitats on the Cumberland Plateau or in the Sequatchie Valley.

Invasive grass headliners

Two invasive grasses rank among the most ecologically damaging non-native plants in Marion County. Both are rated as severe threats by the Tennessee Invasive Plant Council. Additional invasive grasses are treated in the Invasive species and ecological threats section below.

Fungi

Marion County's mixed-hardwood forests and calcareous creek bottoms support a diverse fungal community. The county's position at the junction of the Cumberland Plateau, the Sequatchie Valley, and the Tennessee River Gorge creates a range of habitats for fungi, from the moist cove-hardwood ravines where morels and chanterelles thrive to the dry plateau-rim oaks that partner with boletes and russulas underground. Fungi are not plants; they form their own kingdom, but convention keeps them on the flora page alongside the lichens (which are themselves fungal-algal partnerships).

A caution on foraging: several of the most deadly mushrooms in North America grow in Marion County's woods and lawns, including the destroying angel and the death cap. No rule of thumb (color, habitat, odor, whether animals eat it) reliably separates harmless from lethal species. The only safe approach is confident identification to species using multiple diagnostic features. When in doubt, do not eat.

Morels

Morels are the best-known spring mushroom in Marion County's hardwood forests. They appear in April, usually after soil temperatures hit the mid-50s Fahrenheit and following spring rains. Local lore associates morel flushes with blooming mayapple and redbud. True morels have a honeycomb-patterned cap joined directly to the stem, and the entire mushroom is hollow from the stem base up through the tip of the cap when sliced lengthwise.

Chanterelles and trumpets

Golden chanterelles and their relatives fruit in summer in Marion County's oak-hickory woods, forming mycorrhizal partnerships with the dominant hardwoods. They are solid, egg-yolk yellow to orange, and have blunt, shallow forking ridges on the underside rather than sharp plate-like gills.

Boletes and tooth fungi

Boletes are fleshy mushrooms with a sponge-like pore surface under the cap instead of gills. Marion County's oak-hickory and mixed-hardwood forests support a range of bolete species, from the prized king bolete to several mycorrhizal partners of the dominant canopy trees.

ID gotcha: true morel vs. false morel

ID gotcha: chanterelle vs. jack-o-lantern

Deadly Amanita and other toxic species

Marion County also holds some of the most dangerous mushrooms in North America. The Amanita genus includes both deadly species and the iconic fly agaric. All share a key structural feature: a cup-like volva at the base where the mushroom emerged from its universal veil. When in doubt, do not eat.

Wood-decomposers and bracket fungi

Marion County's mixed-hardwood forests produce a steady supply of dead and downed wood, fueling a diverse community of saprotrophic fungi. Many bracket (shelf) fungi are perennial, adding a new layer of pore tissue each growing season, and a single conk can persist for decades.

Mycorrhizal partners of the hardwood forest

Many of Marion County's fungi form mycorrhizal partnerships with the dominant canopy trees, trading soil nutrients for sugars. The russulas, milkcaps, and boletes that fruit in summer and fall are the visible evidence of a vast underground network connecting the roots of oaks, hickories, and beeches to their fungal partners.

Puffballs, earthstars, and visually distinctive saprobes

Marion County's forests and pastures support a range of fungi that do not produce the familiar cap-and-stem form. Puffballs release their spores through a hole in the top; earthstars split open like a star; jelly fungi take gelatinous or ear-like forms; and cup fungi offer some of the most vivid colors on the winter and spring forest floor.

Other notable gilled mushrooms

Beyond the headliners and the deadly Amanitas, Marion County's forests, lawns, and pastures support a range of gilled mushrooms that visitors are likely to notice.

Lichens

Lichens are composite organisms formed by a fungal partner (the mycobiont) and one or more photosynthetic partners (green algae or cyanobacteria). They colonize surfaces that few other organisms can occupy: bare rock, tree bark, fence posts, and thin soil on exposed outcrops. Marion County's varied substrates, from acidic sandstone on the Cumberland Plateau caprock to calcareous limestone in the Sequatchie Valley, support a rich lichen flora spanning all three major growth forms: foliose (leaf-like), fruticose (shrubby or pendant), and crustose (crust-like).

Many lichens are sensitive to air quality and are used worldwide as biological indicators of atmospheric pollution. The presence of species like lungwort lichen and bushy beard lichen on Marion County's forests is evidence of relatively clean air compared to more urbanized parts of the Tennessee Valley.

Foliose lichens

Foliose (leaf-like) lichens are the most conspicuous group on Marion County's trees and rocks. Each thallus is a composite organism: a fungal partner providing structure and a photosynthetic partner (green algae or cyanobacteria) providing sugars. Many foliose lichens are sensitive to air quality and serve as biological indicators of atmospheric pollution.

Fruticose lichens

Fruticose (shrubby or pendant) lichens hang from branches, rise from soil, or form upright stalks topped with colorful apothecia. Many are sensitive to air pollution and are among the first organisms to disappear when air quality degrades.

Crustose lichens

Crustose lichens grow as thin crusts tightly appressed to rock and bark, often appearing to be part of the substrate itself. Though less conspicuous than their foliose and fruticose relatives, they are the most species-rich lichen group and often the first colonizers of bare rock.

River cane and canebrakes

River cane (Arundinaria gigantea) is the only bamboo native to North America and the largest of the three Arundinaria species documented in Marion County (the two smaller species, hill cane and switch cane, are carded under Native bamboos in the grasses section above). Before European settlement, solid canebrakes covered large portions of the Tennessee River and Sequatchie River bottoms, growing twenty to thirty feet tall in continuous stands that early travelers described as more difficult to cross than any other landscape in the region. The Cherokee used cane for arrow shafts, blowguns, baskets, fish traps, and roofing material. Cane's fibrous root network stabilized riverbanks and filtered sediment from runoff.

By 1900, most Marion County canebrakes had been cleared for pasture and cropland. The plant rarely flowers, and when it does, the flowering canes typically die back. Giant cane reproduces primarily through rhizomes, and without active replanting, cleared canebrakes do not self-restore over human time scales. Across the southeastern United States, an estimated 98 percent of historic canebrake habitat has been lost to agriculture, development, and fire suppression.

Since the early 2000s, the Tennessee River Gorge Trust has been replanting cane on gorge-slope bottomlands as part of its riparian restoration program. TRGT's canebrake restoration involves transplanting rhizome divisions into prepared streamside plots on protected land within the Tennessee River Gorge, where the trust manages over 10,000 acres. Small recovered patches now grow on several TRGT properties along the gorge. The work is slow by nature: cane stands expand outward from planted rhizomes at a pace of roughly one to two feet per year, and a dense canebrake takes decades to re-establish from transplant stock.

Canebrake restoration matters beyond the cane itself. Intact canebrakes filter agricultural and stormwater runoff, stabilize stream banks against erosion, and provide thermal cover for aquatic species in adjacent waterways. Several bird species are canebrake specialists whose populations track cane cover directly: Swainson's warbler nests almost exclusively in dense cane understory, and the hooded warbler and Kentucky warbler use canebrake margins as breeding habitat. Restoring cane in the Tennessee River Gorge supports the broader suite of rare and sensitive species that the gorge's mixed-mesophytic forests harbor.

State symbols and open-country species

Tennessee's state wildflower is passionflower (Passiflora incarnata), and the state cultivated flower is iris (genus Iris; the cultivated form is the European bearded iris, not the native woodland species). Both are common on Marion roadsides through the warm season. The state wildflower is cardded under Passionflower, evening primroses, and other field forbs in the wildflower H2 above. The wider open-country forb roster (milkweeds, goldenrods, asters, sunflowers, ironweeds, Joe-Pye-weeds, blazing stars, fleabanes, thistles, beardtongues, vervains, evening primroses, mountain mints, and the gentian-family pinks) is also cardded in that H2; the smaller dwarf crested iris (Iris cristata) of cove woods is cardded under Other woodland forbs in the same section.

Invasive species and ecological threats

Marion County's native plant communities face ongoing pressure from non-native invasive species and forest pests. The Tennessee Invasive Plant Council (TN-IPC) classifies invasive plants into three tiers: severe threat, significant threat, and lesser threat. Several of Marion's worst invaders arrived through deliberate government-backed introductions in the early and mid twentieth century; others escaped from ornamental plantings or arrived as unintentional stowaways.

Invasive woody plants are carded in their respective group sections above: invasive trees (tree-of-heaven, mimosa, white mulberry, princesstree), invasive shrubs (Chinese privet, Amur honeysuckle, autumn olive, multiflora rose, and sixteen others), invasive vines (Japanese honeysuckle, oriental bittersweet, English ivy, Chinese wisteria, and others), and invasive grasses (Japanese stiltgrass, Johnson grass). The cards below cover the major invasive herbaceous forbs and aquatic plants not treated in those sections, followed by the forest pests and pathogens that have reshaped Marion's canopy.

Invasive herbaceous plants

Aquatic invasive plants

Forest pests and pathogens

Three non-native insects and one fungal pathogen have reshaped Marion County's forest canopy in the last century. Two more pathogens are documented elsewhere in Tennessee and may reach the county in the coming years. The host trees are carded in their respective sections above; the cards below cover the pests and pathogens themselves.

Where to see Marion County flora

• Prentice Cooper State Forest: 24,686 acres on the plateau above the Tennessee River Gorge. Excellent for oak-hickory upland, sandstone rim heath, and cove hardwood along the escarpment.
• Foster Falls Small Wild Area & Fiery Gizzard Trail: mountain laurel, hemlock cove forest, and rockhouse ferns along the plateau escarpment.
• Tennessee River Gorge Trust lands: large-flowered skullcap, canebrake restoration sites, cove hardwoods.
• Coppinger Cove: spring ephemerals and rich cove forest along the Little Sequatchie headwaters.
• Cumberland Trail (Tennessee River Gorge segment): rim heath, sandstone outcrops, long overlooks.

Related

Fauna & Wildlife of Marion County →
Endemic & Notable Species →
Tennessee River Gorge →
The Sequatchie Valley →
Foster Falls & Denny Cove →

Sources

• Tennessee-Kentucky Plant Atlas
• TDEC Division of Natural Areas (Natural Heritage Inventory Program)
• USDA PLANTS Database
• Tennessee River Gorge Trust
• Prentice Cooper State Forest — Tennessee Division of Forestry
• Federal Register: Reclassification of Scutellaria montana (2002)
• USDA APHIS — Hemlock Woolly Adelgid
• USDA APHIS — Emerald Ash Borer
• Tennessee Department of Agriculture — Plant Pests and Quarantines
• Tennessee Invasive Plant Council
• The American Chestnut Foundation
• iNaturalist — Marion County, Tennessee