Silphium perfoliatum var. perfoliatum
Family: Asteraceae
cup plant
Silphium perfoliatum var. perfoliatum image
Stems glabrous, hispid, or scabrous. Peduncles usually scabrous to hispid. 2n = 14. Flowering summer-early fall. Wet prairies, open forests, and river bottoms; 50-500 m; Ont.; Ala., Ark., Conn., Ill., Ind., Iowa, Kans., Ky., La., Mass., Mich., Minn., Miss., Mo., Nebr., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Pa., S.Dak., Tenn., Tex., Vt., Va., W.Va., Wis.
Stem generally glabrous or nearly so, sometimes spreading-hairy toward the base; most of the lvs, except for a few upper ones, generally ┬▒evidently wing-petiolate, the lower surface glabrous or short-hairy, seldom any of the hairs as much as 1 mm; head with mostly 16-35 (commonly ca 21 or 34) rays; invol bracts glabrous except for the ciliate margins; widespread, mainly to the w. or n. of var. connatum.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
From Flora of Indiana (1940) by Charles C. Deam
Found throughout the state although it may be absent from a few of our northern counties. It is generally found on the alluvial banks of streams and on the low borders of lakes. It is found both in woodland and in open places and sometimes in low ground along roadsides.