• Authority

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

  • Family


  • Scientific Name


  • Description

    Genus Description - Rays pistillate and fertile, yellow, inconspicuous, commonly solitary, or sometimes wanting; invol of 2–8 subequal greenish bracts, occasionally with 1 or 2 smaller outer ones; receptacle small, naked or sometimes bristly; disk-fls 1–15, perfect and fertile, yellow; style-branches flattened, truncate, minutely penicillate; achenes glabrous, ca 10-ribbed; pappus wanting, or of 2–4 irregular scales; herbs with narrow, opposite, sessile and often connate lvs, and numerous small, sessile or subsessile glomerate heads. 20, New World.