• 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 - Heads radiate, the rays pistillate and fertile, yellow or orange; invol bracts biseriate, the inner distinct or weakly connate at the base; receptacle naked, flat to convex; disk-fls numerous, tubular and perfect; style-branches flattened, subtruncate, shortly penicillate around the tip, and with a minute terminal cone; achenes slender, ± striate; pappus of 12–22 scales, each scale cleft into 5–10 bristles; aromatic herbs with pinnatifid to pinnately dissected, mainly opposite lvs, these and the invol beset with scattered embedded oil-glands. 7, New World.