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Appalachian Goldenrod,
Solidago flaccidifolia
Stem striate-angled, green, glabrous or sparsely to moderately hairy, per Weakley's Flora (2022).
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Curtis's Goldenrod,
Solidago curtisii
Stem striate-angled, green [not glaucous], glabrous or sparsely pubescent, per Weakley's Flora (2015).
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Slender Goldenrod,
Solidago erecta
Stems are glabrous from the base to near or into the inflorescence, per Asterae Lab: Classification and illustrations of goldenrods (J.C. Semple).
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Slender Goldenrod,
Solidago erecta
Phyllaries appressed, strongly unequal, obtuse to rounded, glabrous, per Flora of North America.
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Showy Goldenrod,
Solidago speciosa
Stems are erect, glabrous proximally to strigillose in the floral arrays, per Flora of North America.
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Showy Goldenrod,
Solidago speciosa
Phyllaries in 3-4 series, appressed, strongly unequal, glabrous, per Flora of North America.
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Narrowleaf Showy Goldenrod,
Solidago rigidiuscula
Leaves and upper stems glabrous, per Weakley's Flora (2023).
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Narrowleaf Showy Goldenrod,
Solidago rigidiuscula
Phyllaries in 3-5 series, unequal, oblong, usually obtuse, glabrous or with ciliate margins, per The Illustrated Flora of Illinois: Asteraceae, Part 1 (Mohlenbrock, 2015).
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Early Goldenrod,
Solidago juncea
Stems glabrous or nearly so. Petiole bases of basal and lower stem leaves not sheathing the stem, per Weakley's Flora (2023).
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Gorge Goldenrod,
Solidago faucibus
Leaves abaxially glabrous, per Flora of North America.
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Northern Roughleaf Goldenrod,
Solidago patula
Blades relatively thick, margins serrate, apices acute, abaxially glabrous, adaxially scabrous, per Flora of North America.
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Smooth Goldenrod,
Solidago gigantea
Stems glabrous and usually also glaucous, per Weakley's Flora (2012).
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Carolina Goldentop,
Euthamia caroliniana
Leaves linear, 2-7cm long, 1-3mm wide, glabrous, 1-veined, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Camphorweed,
Heterotheca subaxillaris
Disc flower nutlets pubescent w tan pappus; ray nutlets glabrous w no pappus, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Cup-plant,
Silphium perfoliatum
Stem square in crosssection, glabrous or glabrescent (vs. stem of S. connatum spreading-hispid), per Weakley's Flora (2023).
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Virginia Cup-plant,
Silphium connatum
Stem square, and spreading-hispid (rarely nearly glabrous), per Weakley's Flora (2023).
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Carolina Rosinweed,
Silphium compositum var. compositum
Bracts wide, acute or obtuse, glabrous, ciliate or erose, usually squarrose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Ragged Rosinweed,
Silphium reniforme
Bracts wide, acute or obtuse, glabrous, ciliate or erose, usually squarrose, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Starry Rosinweed,
Silphium dentatum
Stems glabrous or less often scabrous or spreading pubescent, leafy to summit, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Starry Rosinweed,
Silphium asteriscus var. asteriscus
Involucral bracts ciliate, glabrous or pubescent on the backs, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Whorled Rosinweed,
Silphium asteriscus var. trifoliatum
Cauline leaves predominately in whorls of 3. Leaf surfaces glabrous, per Weakley's Flora.
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False Sunflower,
Heliopsis helianthoides var. helianthoides
Leaf underside is glabrous and a lustrous green.
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False Sunflower,
Heliopsis helianthoides var. helianthoides
Bracts oblong, glabrous, cartilaginous w foliaceous, often spreading, apices, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Greenheaded Coneflower,
Rudbeckia laciniata var. laciniata
Involucral bracts lanceolate to oblanceolate, essentially glabrous, acute, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Blue Ridge Cutleaf Coneflower,
Rudbeckia laciniata var. humilis
Involucral bracts lanceolate to oblanceolate, essentially glabrous, acute, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Common Three-lobed Coneflower,
Rudbeckia triloba var. triloba
Stems terete, ribbed, spreading pubescent to glabrous, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Smooth Coneflower,
Echinacea laevigata
Leaves lance-ovate to elliptic, glabrous & smooth, base cuneate to attenuate, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Longleaf Sunflower,
Helianthus longifolius
Leaves 10-20x as long as wide, basally disposed, glabrous, per Weakley's Flora.
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Showy Sunflower,
Helianthus laetiflorus
Stems scabrous and spreading pubescent, somewhat glabrous above, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Thinleaf Sunflower,
Helianthus decapetalus
Upper stems have short bristly hairs; lower glabrous, sometimes glaucous, per www.illinoiswildflowers.info.
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Smith's Sunflower,
Helianthus smithii
Leaves nearly glabrous, per Weakley's Flora (2020).
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Whiteleaf Sunflower,
Helianthus glaucophyllus
Leaves glabrous and glaucous beneath, 10-25cm long, 3-8cm wide, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Roughleaf Sunflower,
Helianthus strumosus
Differs from H. tuberosus in its glabrous/glabrate stems and lack of tubers, per Flora of North America.
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East Florida Beach Sunflower,
Helianthus debilis ssp. debilis
Stems glabrous or puberulent; leaves serrulate to evenly serrate, per Weakley's Flora (2023).
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Savanna Coreopsis,
Coreopsis linifolia
Leaf blades linear-oblanceolate to linear, margins glabrous, surfaces w numerous tiny dark dots, per Weakley's Flora (2022).
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Lanceleaf Coreopsis,
Coreopsis lanceolata
Plant glabrous except the ciliate bases of the leaves, per Manual of the Southeastern Flora (JK Small, 1933).
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Whorled Coreopsis,
Coreopsis major var. rigida
Outer phyllaries slightly short-pubescent to glabrous, per Weakley's Flora (2015).
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Whorled Coreopsis,
Coreopsis major var. rigida
Stems and leaves glabrous, or essentially so, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).
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Purplestem Beggarticks,
Bidens connata
The stems are light green to purple, more or less terete, and glabrous, per www.illinoiswildflowers.info.
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Purplestem Beggarticks,
Bidens connata
3-8 green, leafy, glabrous, oblanceolate, elliptic, or oblong bracts, per www.illinoiswildflowers.info.
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Savannah Sneezeweed,
Helenium vernale
Peduncles usually glabrous, sometimes sparsely hairy; cypselae glabrous, per Flora of North America.
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Muster John Henry,
Tagetes minuta
Pungent aromatic, glabrous, annual herbs. Stems erect, 0.5-2m tall, per Vascular Flora of the Carolinas (Radford, Ahles, & Bell, 1968).