• 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 - Cal-tube chartaceous, of nearly uniform texture throughout, not ruptured by the developing fr, the lobes greenish and commonly more herbaceous; cor tubular- funnelform to nearly salverform; stamens included, often unequal or unequally inserted; seeds 1–3 per locule, those of the annual spp. becoming mucilaginous when wet; annual (seldom perennial) herbs with alternate, entire (ours) to variously dissected lvs, but without well defined lfls; fls mostly in terminal, head-like cymes. 13, temp. New World, mostly w. U.S.