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Kentucky Yellow Lady's Slipper,
Cypripedium kentuckiense
Purple-brown sepals & twisted petals; the lip a creamy to dull yellow pouch, per Wildflowers of Tennessee (Carman, 2005).
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Showy Lady's Slipper,
Cypripedium reginae
Sepals are white, round-oval, 1.2-1.8" long, per Wildflowers of Tennessee (Carman, 2005).
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Ragged Fringed Orchid,
Platanthera lacera
Sepals ovate to elliptic, obtuse, 4-6mm long, 3-4mm wide, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Water-spider Orchid,
Habenaria repens
The petals and lip resemble spider legs splayed against the plant's sepals, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Yellow Fringed Orchid,
Platanthera ciliaris
A dorsal sepal acts as a "hood" and 2 lateral sepals are reflexed, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Three Birds Orchid,
Triphora trianthophoros var. trianthophoros
Petals and sepals may be pure white or white tipped with pink or purple, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Large Whorled Pogonia,
Isotria verticillata
The long dark sepals & gaping lip resemble a large insect waiting for prey, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Large Whorled Pogonia,
Isotria verticillata
3 long, narrow sepals are light green at base, dark purplish-brown at tips, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Small Whorled Pogonia,
Isotria medeoloides
The flower is surrounded by three 1" sepals the same color as the leaves, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Rose Pogonia,
Pogonia ophioglossoides
Sepals and petals usually pink, the lip tipped with deep purplish magenta, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Large Dragonhead Pogonia,
Cleistesiopsis divaricata
Narrow mahogany-colored sepals stretch upward, are about as long as petals, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Appalachian Dragonhead Pogonia,
Cleistesiopsis bifaria
Narrow mahogany-colored sepals stretch upward, are about as long as petals, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Appalachian Dragonhead Pogonia,
Cleistesiopsis bifaria
Sepals (24-) 30-40 (-55) mm long; petals 21-36 mm long, per Weakley's Flora (2023).
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Bog-rose,
Arethusa bulbosa
Petals and sepals generally point upward; lip curls downward like a tongue, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Common Grass-pink,
Calopogon tuberosus var. tuberosus
Sepals and lateral petals are nearly alike, spreading, 0.6-1" long, per Wildflowers of Tennessee (Carman, 2005).
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Pale Grass-pink,
Calopogon pallidus
Lateral sepals are curved toward the stem and petals are curved forward, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Pale Grass-pink,
Calopogon pallidus
Lateral sepals distinctively reflexed backward w their apices behind flower, per Atlantic Coastal Plain Wildflowers (Nelson, 2006).
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Oklahoma Grass-pink,
Calopogon oklahomensis
Lateral sepals weakly falcate to straight, per Weakley's Flora.
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Great Plains Ladies'-tresses,
Spiranthes magnicamporum
Lateral sepals usually separate from other flower parts, curving in and up, per Native Orchids of the Southern Appalachian Mountains (Bentley, 2000).
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Grassleaf Ladies'-tresses,
Spiranthes praecox
Lip has green veins radiating from its center. Lateral sepals appressed, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Downy Rattlesnake-orchid,
Goodyera pubescens
Sepals and petals glandular-pubescent on outer surface, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Cranefly Orchid,
Tipularia discolor
Flowers have narrow sepals and petals and are about 1/2-3/4" wide, per Wild Orchids of South Carolina: A Popular Natural History (Fowler, 2005).
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Sweet-fern,
Comptonia peregrina
Flowers without sepals or petals, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
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Pecan,
Carya illinoinensis
In Carya the husk is derived from bract and bracteoles not the sepals, per Evolution, Phylogeny, and Systematics of Juglandaceae (Manos & Stone, 2001).
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Japanese Hops,
Humulus scandens
Five sepals, petals absent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Nestronia,
Nestronia umbellula
Small greenish flowers w 4-5 petal-like sepals. Male flowers are in umbels, per Guide to the Wildflowers of SC, 1st ed. (Porcher & Rayner, 2001).
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Sandhill Wild-buckwheat,
Eriogonum tomentosum
Calyx of 2 whorls, each of 3 united sepals. Petals absent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Wild Dock,
Acetosa hastatula
Inner sepals cordate with a wide, membranous, erose wing, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Wild Dock,
Acetosa hastatula
Enlarged wing-like heart-shaped sepals encase the nutlet, per Forest Plants of the Southeast and Their Wildlife Uses (Miller & Miller, 2005).
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Curly Dock,
Rumex crispus ssp. crispus
Calyx has 3 narrow outer sepals & 3 inner sepals that expand in fruit, per Wildflowers of Tennessee, the Ohio Valley, and the Southern Appalachians (Horn, Cathcart, Hemmerly, & Duhl, 2005).
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Erect Knotweed,
Polygonum erectum
Sepals green with a narrow yellowish or whitish margin, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Climbing Buckwheat,
Fallopia convolvulus
Sepals enlarging little as fruit matures, per Aquatic and Wetland Plants of Southeastern United States (Godfrey & Wooten, 1979 & 1981).
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Southern Jointweed,
Polygonella americana
Petals absent. Sepals to 3mm long, white, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common October-flower,
Polygonella polygama
The 5 sepals are each about 1mm long and broad, 3 erect and 2 bent back, per Wildflowers of the Sandhills Region (Sorrie, 2011).
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Sandhill Jointweed,
Polygonella fimbriata
This differs from all our other species in having the inner sepals fimbriate, per Weakley's Flora (2015).
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Mexican-tea,
Dysphania ambrosioides
Each flower with 5 sepals, 5 stamens, and 2-3 stigmas; petals absent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Lambsquarters,
Chenopodium album var. album
Each flower with 5 sepals, 5 stamens, and 2-3 stigmas; petals absent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Alligator-weed,
Alternanthera philoxeroides
Each flower w 5 minute petals (actually sepals) surrounding yellow anthers, per A Field Guide for the Identification of Invasive Plants in Southern Forests (Miller, Chambliss, & Lowenstein, 2010).
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Common Pokeweed,
Phytolacca americana
5-30 stamens that are as long as the sepals. Superior ovary, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Pokeweed,
Phytolacca americana
Flowers have 5 round greenish-white or pinkish petaloid sepals [no petals], per Wildflowers of the Southern Mountains (Smith, 1998).
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Large Sea-purslane,
Sesuvium portulacastrum
Flowers on pedicels 3mm or longer. Sepals green outside and pink within, per Wildflowers of the Eastern United States (Duncan & Duncan, 1999).
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Carpetweed,
Mollugo verticillata
A few 3/16" flowers from each node. Sepals white but green-striped beneath, per Wildflowers of the Southern Mountains (Smith, 1998).
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Spring-beauty,
Claytonia virginica var. virginica
Two sepals, each 4-9mm long, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Carolina Spring-beauty,
Claytonia caroliniana
Sepals persistent, leaflike, unequal, 3-5mm, per Flora of North America.
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Narrow-leaved Montia,
Montia linearis
Inflorescences terminal, of 2-8 flowers; sepals 2, persistent and unequal; petals 5, white, per Flora of North America.
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Appalachian Fameflower,
Phemeranthus teretifolius
Sepals caducous [falling off early], per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Silverling,
Paronychia argyrocoma
Flowers mostly hidden by conspicuous silvery bracts; sepals white on margins, per Wildflowers of Tennessee (Carman, 2005).
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Mountain Nailwort,
Paronychia montana
Sepals not petaloid, green, sometimes scarious-margined; perigynous zone ~ shorter than sepals, per Weakley's Flora (2023).
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Common Chickweed,
Stellaria media
Sepals usually glandular-hairy w obtuse apex, longer than or equaling petals, per Flora of North America.
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Lesser Stitchwort,
Stellaria graminea
The 5 petals exceed the sepals and are cleft almost to the base, per Wildflowers of the Southern Mountains (Smith, 1998).
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Star Chickweed,
Stellaria pubera
Sepals are acute to obtuse and shorter than the petals, per Wildflowers of Tennessee (Carman, 2005).
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Tennessee Starwort,
Stellaria corei
Very similar to S. pubera but differs in its long-acuminate sepals, per Flora of North America.
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Tennessee Starwort,
Stellaria corei
Similar to S. pubera, but the sepals are acuminate, and equal to or longer than the petals, per Wildflowers of Tennessee (Carman, 2005).
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Tennessee Starwort,
Stellaria corei
Sepals 7-11(-12)mm long, acuminate, ciliate, but more-or-less glabrous on the back, per Weakley's Flora (2022).
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Common Mouse-ear Chickweed,
Cerastium fontanum ssp. vulgare
Flowers 1/4" wide, the petals cleft and about equaling the sepals, per Wildflowers of the Southern Mountains (Smith, 1998).
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Sticky Mouse-ear,
Cerastium glomeratum
Sepals green, apex very acute, usually w glandular hairs & long white hairs, per Flora of North America.
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Gray Mouse-ear Chickweed,
Cerastium brachypetalum
Pedicels erect or ascending, 6-15 mm, shaggy. Sepals densely pubescent, per Flora of North America.
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Nodding Mouse-ear Chickweed,
Cerastium nutans var. nutans
Sepals ~1/5" long & pointed; petals bisected, as long or longer than sepals, per Vascular Plants of North Carolina.
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Carolina Sandwort,
Geocarpon carolinianum
Sepals obtuse at the tip, per Weakley's Flora (2015).
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Piedmont Sandwort,
Geocarpon uniflorum
Pedicels and sepals glabrous, petals 1-7mm long, per Weakley's Flora (2015).