Erect annual 1–4 dm, simple or branched above; lvs linear or narrowly elliptic, 1–4 cm × 1.5 mm; racemes sessile or short-peduncled, very dense, head-like, rounded or short-cylindric, 1 cm thick, the floriferous portion 1–2 cm, the whole axis to 4 cm; fls rose-purple, white, or greenish; wings oval, 3–5 mm, or longer in fr, blunt, with conspicuous midvein; cor half as long as the wings; seed pyriform, the 2 linear lobes of the aril extending beyond the middle. Fields, meadows, and open woods; N.S. to Minn., s. to S.C. and La. July–Sept. (P. viridescens)
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