Silphium perfoliatum

Linnaeus

Syst. Nat. ed. 10, 2: 1232. 1759.

Common names: Cup plant
Endemic
Treatment appears in FNA Volume 21. Treatment on page 79. Mentioned on page 77.

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

V21-175-distribution-map.gif

Ont., Ala., Ark., Conn., Ill., Ind., Iowa, Kans., Ky., La., Mass., Mich., Minn., Miss., Mo., N.C., N.Dak., N.J., N.Y., Nebr., Ohio, Okla., Pa., S.Dak., Tenn., Tex., Va., Vt., W.Va., Wis.

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
... more about "Silphium perfoliatum"
Jennifer A. Clevinger +
Linnaeus +
Cup plant +
Ont. +, Ala. +, Ark. +, Conn. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, N.C. +, N.Dak. +, N.J. +, N.Y. +, Nebr. +, Ohio +, Okla. +, Pa. +, S.Dak. +, Tenn. +, Tex. +, Va. +, Vt. +, W.Va. +  and Wis. +
Syst. Nat. ed. +
Undefined (tribe Undefined) subtribe Enceliinae +, Undefined (tribe Undefined) subtribe Engelmanniinae +, Undefined (tribe Undefined) subtribe Spilanthinae +, Undefined (tribe Undefined) subtribe Verbesininae +  and Undefined (tribe Undefined) subtribe Zinniinae +
Silphium perfoliatum +
Silphium +
species +