Silphium trifoliatum L. var. trifoliatum
-
Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
-
Family
Asteraceae
-
Scientific Name
-
Description
Variety Description - Lvs mostly ternate or quaternate, occasionally opposite, seldom partly alternate, scabrous above, hirsute at least on the midrib beneath, the blade lanceolate or lance-elliptic to rather narrowly lance-ovate, (2.5–)3–5 times as long as wide, 7–20 × 1.5–5 cm, tapering to a hirsute-ciliate petiole to 1.5 cm, or to a shortly subpetiolar base; n. var., from se. Pa. to O. and Ind., s. to Va. and in the mt. region to Ga.