Helianthus silphioides Nutt.

• 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

  Helianthus silphioides Nutt.

• Description

  Species Description - Similar to H. atrorubens, and passing into it where their ranges overlap; stems commonly several, to 3 m, relatively more leafy, often to above the middle; blades relatively broad, generally only 1–1.7(–2) times as long as wide, on short, generally inconspicuously hairy petioles that are seldom more than 1/3 as long as the blade and seldom conspicuously wing-flared upward; invol bracts not always ciliolate; 2n=34. Basically Ozarkian, from Ark. and s. Mo. to c. La., e. to s. Ill., w. Ky., and Tenn. July–Oct. Perhaps better called H. atrorubens var. pubescens Kuntze.

• Common Names

  Ozark sunflower