Inflorescences interrupted or condensed distally. Fruits (2.3-)2.5-3.5 mm; wing usually 0.2-0.3 mm wide (occasionally fruits almost wingless in some southwestern plants). Flowering late summer-fall. Sand dunes, sandy and gravely shores, sandy waste places, fields; 100-2000 m; Alta., B.C., Man., Ont., Que., Sask.; Ariz., Ark., Calif., Colo., Idaho, Ill., Ind., Kans., Minn., Mo., Mont., Nebr., Nev., N.J., N.Mex., N.Y., N.Dak., Ohio, Okla., Oreg., S.Dak., Tex., Utah, Wash., Wis., Wyo.; n Mexico (Chihuahua); probably Europe (locally introduced and confused with C. nitidum).
Much like no. 2 [Corispermum hyssopifolium L.], but with merely angled frs 2-3 mm; infl ±densely pubescent, esp. when young; bracts overlapping, but exposing the axis along the lower part of the infl; 2n=18. Native of Eurasia, now established as a weed in much of the U.S., esp. in sandy soil and along lake-shores. (C. emarginatum; C. villosum)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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