Glabrous annual 1-3 dm, simple below, branched above into a dichasial cyme; lvs all or mostly opposite, oblong to obovate, 3-15 mm; pedicels very slender, terete, the lowest 10-25 mm, the upper shorter; sep glandular-ciliate; pet white with a yellow claw, 4-8 mm; staminodia tiny, triangular; fr ovoid-globose, 2-2.5 mm, fragile; false septa incomplete, long-ciliate; 2n=16. Native of Europe; intr. in disturbed sites from Nf. and N.S. to N.J. and Pa., w. to n. Mich. July-Sept. (L. pratense; Cathartolinum c.)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.