Branching, glabrous or granular-scaberulous annual to 3 dm, turning red in autumn; lvs linear or narrowly elliptic, entire, to 6 cm נ8 mm; fls individually solitary in the forks of the diffusely and slenderly branched axillary dichasial cymes, the ultimate branches appearing as slender spines 1-4 mm; sep 5; seeds horizontal to erect, dull blackish, 0.6-0.7 mm wide. Native to c. and e. Asia, locally established as a weed in Mich.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.