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Silphium radula
Nutt.
Family:
Asteraceae
Rough-Stem Rosinweed
FNA
Resources
Jennifer A. Clevinger in Flora of North America (vol. 21)
Plants
caulescent, 30-250 cm; fibrous rooted.
Stems
terete, scabrous, hispid, or hirsute.
Leaves:
basal persistent or caducous, petiolate; cauline alternate or opposite, petiolate or sessile; blades lanceolate to ovate, 2-22 × 0.5-8 cm, bases attenuate to round, margins coarsely dentate or entire, apices acuminate to acute, faces scabrous, hispid, or hirsute.
Phyllaries
18-37 in 2-4 series, outer appressed or reflexed, apices acute, abaxial faces scabrous.
Ray florets
12-30+; corollas yellow.
Disc florets
100-175; corollas yellow.
Cypselae
10-17 × 7-15 mm;
pappi
2-5 mm.
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This project made possible through support from the UF Planning, Design & Construction and the UF Office of Sustainability
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