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.