• 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 - Fls perfect; receptacle small, flat; sep 3, ovate to ovate-oblong, persistent; pet 3; stamens 6, the filaments equaling or longer than the anthers; pistils 10–28, in a single whorl; style lateral; achenes flattened but not winged, grooved on the curved back; infl ample, paniculate, the axis and larger branches bearing a whorl of pedicels or branches at each node; perennial; plants erect, or lax in deep-water forms; lvs never sagittate. 9, mainly N. Hemisphere.

  • Common Names