Rumex crispus L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Stout, taprooted perennial to 1.5 m, simple to the infl; lvs strongly crisped, the larger commonly rounded to subcordate at the base; infl large, with many ascending or erect branches, becoming compact at maturity, with some linear lvs intermingled; pedicels flexuous, 5–10 mm, spreading-decurved, jointed near the base; valves thin, broadly ovate, 4–5 mm long and wide, entire or nearly so, obtuse, truncate or subcordate at base; grains 3, often unequal, the larger broadly ovoid, very turgid, rounded at both ends, half as long as the valve; 2n=60. Native of Europe, found as a weed of roadsides, fields, and waste ground throughout the U.S. and s. Can. (R. elongatus) Hybridizes with nos. 9 [Rumex patientia L.] and 16 [Rumex obtusifolius L.].