Silphium perfoliatum
Syst. Nat. ed. 10, 2: 1232. 1759.
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](/w/images/d/d7/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 |
"broader" is not a number.