Show Lower Taxa
Difference between revisions of "Silphium perfoliatum"
Syst. Nat. ed. 10, 2: 1232. 1759.
Common names: Cup plant
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | ||
Revision as of 16:32, 18 September 2019
Plants caulescent, 75–300 cm; fibrous rooted. Stems square, glabrous, hispid, or scabrous. Leaves: basal caducous; cauline usually opposite, rarely whorled (in 3s), petiolate or sessile; blades deltate, lanceolate, or ovate, 2–41 × 0.5–24 cm, bases attenuate or truncate (distal connate-perfoliate), margins entire, dentate, or bidentate, apices acuminate to acute, faces scabrous to hispid. Phyllaries 25–37 in 2–3 series, outer appressed, apices acute to acuminate, abaxial faces scabrous or hispid. Ray florets 17–35; corollas yellow. Disc florets 85–150 (–200); corollas yellow. Cypselae 8–12 × 5–9 mm; pappi 0.5–1.5 mm.
Distribution
e North America.
Discussion
Varieties 2 (2 in flora).
Selected References
None.
Key
| 1 | Stems glabrous or sparsely scabrous; peduncles glabrous | Silphium perfoliatum var. connatum |
| 1 | Stems glabrous, hispid, or scabrous; peduncles usually scabrous to hispid | Silphium perfoliatum var. perfoliatum |