Slender annual 1–4 dm, branched above; lvs alternate or scattered or the lowest occasionally in whorls of 2–5, linear, 1–2 cm × 1–2(–3) mm; peduncles 2–8 cm; bracts deciduous; racemes very slender, the whole axis to 10 cm, the floriferous or fructiferous part 1–5 cm, becoming interrupted at base; pedicels 0.5 mm; fls white or greenish-white; wings about equaling the fr. Open woods and fields, especially in sandy soil; Me. to n. N.H., Mich., and Mo., s. to Ga., Ala., and Okla. June–Oct. Wings usually 1.3–1.7 mm; plants from S.C. to se. Va., and from Mo., Ark., and Okla., with wings 2–2.6 mm, have been called P. verticillata var. dolichoptera. (P. verticillata var. a.)
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