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Downy Beardtongue,
Penstemon australis
Cauline leaves glabrous to pubescent, moderately thick, narrowly lanceolate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Foxglove Beardtongue,
Penstemon digitalis
Leaves glabrous, subcoriaeceous, denticulate to subentire, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Eastern Figwort,
Scrophularia marilandica
Stems slightly hairy or glabrous, often 4-angled and furrowed, per www.illinoiswildflowers.info.
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Oldfield Toadflax,
Linaria canadensis
Pedicels erect, 1.8-5.5mm in fruit, sparsely glandular-pubescent, sometimes glabrous, per Flora of North America.
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Comb Seymeria,
Seymeria pectinata ssp. pectinata
Corolla of S. pectinata is pubescent externally [vs. S. cassinoides' glabrous], per Weakley's Flora (2022).
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Comb Seymeria,
Seymeria pectinata ssp. pectinata
Stem of S. pectinata is pubescent [vs. S. cassinoides' glabrous or puberulent], per Weakley's Flora (2022).
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Appalachian Oak-leach,
Aureolaria levigata
Inflorescence, pedicels and calyx glabrous; flowering Aug-Sep, per Weakley's Flora.
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Smooth False Foxglove,
Aureolaria flava
Inflorescence, pedicels and calyx glabrous, flowering Aug-Sep, per Weakley's Flora.
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Smooth False Foxglove,
Aureolaria flava
Pedicels upwardly curved. Capsule glabrous, 12-20mm long, per Weakley's Flora.
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Wand Gerardia,
Agalinis virgata
Branches virgate [wand-like; straight, slender and erect]; stems glabrous, per Weakley's Flora.
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Asian Marshweed,
Limnophila sessiliflora
Aerial leaf blades elliptic-lanceolate, glabrous, margin crenate to lobed, per Flora of China.
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Common Plantain,
Plantago major
Lvs glabrous to very pubescent, petioles green (rarely w slight purple tinge), per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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American Plantain,
Plantago rugelii
Leaves glabrous or essentially so, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Rough Mexican-clover,
Richardia scabra
Leaves are glabrous except hairy midrib and margins, and very short-stalked, per Wildflowers of the Sandhills Region (Sorrie, 2011).
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Diamond-flower,
Oldenlandia corymbosa
Calyx glabrous, calyx lobes minute and subulate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Granite Dome Bluet,
Houstonia longifolia var. glabra
Leaves 1.5-6.0mm wide, 4-11x long as wide. Stems glabrous or glabrate, per Weakley's Flora.
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Japanese Honeysuckle,
Lonicera japonica
Stems glabrous to densely pubescent, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Yellow Honeysuckle,
Lonicera flava
Leaves glabrous on the upper surface, gray beneath, per Weakley's Flora.
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Blackhaw,
Viburnum prunifolium
Leaf lower surfaces paler than upper, glabrous or nearly so; petioles red, per Native Trees of the Southeast, An Identification Guide (Kirkman, Brown, & Leopold, 2007).
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Streamhead Lobelia,
Lobelia batsonii
Inflorescence secund. Calyx glabrous, as are corolla tube interior & throat, per Lobelia batsonii (Campanulaceae), A New Species from the Sandhills of the Carolinas (Pittman & Sorrie, 2020).
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Slender Rattlesnake-root,
Nabalus autumnalis
Dandelion-like leaves slightly clasp the tall, glabrous stem. — Will Stuart
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Slender Rattlesnake-root,
Nabalus autumnalis
Calyculi green to purple, triangular to subulate; phyllaries pink or purple, glabrous, per Flora of North America.
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Tall Rattlesnake-root,
Nabalus altissimus
Recognized by narrow involucres with 5 pale green, glabrous phyllaries, in combination with...
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Red Wood Lettuce,
Lactuca hirsuta
The midrib may be either pubescent (var. sanguinea) or glabrous (f. calviflora) beneath, per Noteworthy Plants of Southeastern Virginia (Fernald, 1938).
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Red Wood Lettuce,
Lactuca hirsuta
Var. sanguinea: Stem glabrous or essentially so, per Noteworthy Plants of Southeastern Virginia (Fernald, 1938).
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Red Wood Lettuce,
Lactuca hirsuta
The midrib may be either pubescent (var. sanguinea) or glabrous (f. calviflora) beneath, per Noteworthy Plants of Southeastern Virginia (Fernald, 1938).
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Field Sowthistle,
Sonchus arvensis var. glabrescens
Heads 30-50mm across in flower. Phyllaries and peduncles glabrous, per Weakley's Flora (2015).
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Whiplash Hawkweed,
Pilosella flagellaris
Leaves nearly glabrous on the upper surface, per Weakley's Flora (2022).
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Virginia Dwarf-dandelion,
Krigia virginica
Leaf faces glabrous, eglandular or loosely glandular-villous, per Flora of North America.
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Butterweed,
Packera glabella
Thickened 1-2.5' stem erect, mostly glabrous, but often hairy in leaf axils, per Atlantic Coastal Plain Wildflowers (Nelson, 2006).
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Blue Ridge Ragwort,
Packera millefolium
Flower heads arranged in open, corymbiform arrays. Peduncles glabrous, per Flora of North America.
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Blue Ridge Ragwort,
Packera millefolium
Phyllaries (13-)21, green, glabrous (tips sometimes hair-tufted), per Flora of North America.
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Woolly Ragwort,
Packera dubia
Phyllaries 13 or 21, light green, usually glabrous(sometimes hairy proximally), per Flora of North America.
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Robbins' Ragwort,
Packera schweinitziana
Phyllaries 13 or 21, light green (tips sometimes black), 5-8mm, glabrous, per Flora of North America.
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Tennessee Ironweed,
Vernonia flaccidifolia
Stem leaves abundant, stems glabrous. Flowers 16-26 per head, per Wildflowers of the Eastern United States (Duncan & Duncan, 1999).
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Dense Blazing-star,
Liatris spicata
Stems glabrous or puberulent (not glandular), per Weakley's Flora (2022).
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Narrowleaf Blazing-star,
Liatris microcephala
Lower leaves linear to narrowly elliptic, 5-15cm long, 1-5mm wide, glabrous, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Narrowleaf Blazing-star,
Liatris microcephala
Phyllaries essentially glabrous, margins with hyaline borders, apices rounded, per Flora of North America.
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Grassleaf Blazing-star,
Liatris pilosa
Stems to 1.5m tall. Lower leaves 5-20cm long, 2-10mm wide, glabrous, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Wand Blazing-star,
Liatris virgata
Stems glabrous. Heads on internodes 6-15 (-20) mm long, not secund, per Weakley's Flora (2012).
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Chapman's Blazing-star,
Liatris chapmanii
Florets 3-4 [per head]; corolla tubes glabrous inside, per Flora of North America.
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Southern Blazing-star,
Liatris squarrulosa
Phyllaries glabrous to puberulent or puberulent-hirtellous, outer us. reflexed, per Weakley's Flora.
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Rough Blazing-star,
Liatris aspera
Phyllaries glabrous, the outer (at least) usually reflexing, per Weakley's Flora (2012).
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Deer's-tongue,
Trilisa paniculata
Stems of T. paniculata are densely pubescent; T. odoratissima's are glabrous. — Will Stuart
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Sandhill Chaffhead,
Carphephorus bellidifolius
Phyllaries broadly elliptic to elliptic-obovate, glabrous, apices rounded, per Flora of North America.
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Florida Paintbrush,
Carphephorus corymbosus
Phyllaries in 3 series, broadly elliptic, glabrous, eglandular, apices rounded, per Flora of North America.
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Trampweed,
Facelis retusa
Leaves numerous, ascending, linear-spatulate, upper green & nearly glabrous, per Wildflowers of the Eastern United States (Duncan & Duncan, 1999).
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Elegant Cudweed,
Gamochaeta impatiens
Involucres 2.5-3.0 mm high, more-or-less purplish, the bases glabrous, per Weakley's Flora (2020).
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Elegant Cudweed,
Gamochaeta impatiens
Leaf blades spatulate to oblanceolate-obovate, adaxially glabrous or glabrate, per Flora of North America.
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Tropical Horseweed,
Erigeron sumatrensis
Involucre densely pubescent, vs that of E. canadensis or pusillus glabrous or sparsely pubescent, per Weakley's Flora (2022).
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Common Horseweed,
Erigeron canadensis
Stem coarsely spreading-hirsute (vs E. pusillus stem glabrous or widely scattered appressed hairs), per Weakley's Flora.
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Common Horseweed,
Erigeron canadensis
Stem spreading pubescent, rarely glabrous (whereas var. pusillus is glabrous), per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Southern Horseweed,
Erigeron pusillus
Stem glabrous or widely scattered appressed hairs; lvs w a few cilia near base, per Weakley's Flora.
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White Wood-aster,
Eurybia divaricata
Leaves essentially glabrous, smooth to slightly scabrous above, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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White Arrowleaf Aster,
Symphyotrichum urophyllum
Lower stems glabrous; upper stems sparsely hirtellous or pilose, per Weakley's Flora (2015).
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Wavyleaf Aster,
Symphyotrichum undulatum
Stem densely puberulent, rarely glabrous, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Low Showy Aster,
Eurybia spectabilis
Leaves firm (reticulately veined), faces usually scabrous (esp. abaxially), sometimes glabrous, per Flora of North America.
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Creeping Aster,
Eurybia surculosa
Leaves very obscurely veined beneath, entire or nearly so, glabrous on the undersurface, per Weakley's Flora (2022).
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Curtis's Aster,
Symphyotrichum retroflexum
Stem leaves smooth & glabrous on both surfaces (or slightly pubescent beneath), per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Small White Oldfield Aster,
Symphyotrichum racemosum var. subdumosum
Phyllaries in 4-6 series, unequal, appressed or the outer spreading, glabrous, per The Illustrated Flora of Illinois: Asteraceae, Part 1 (Mohlenbrock, 2015).