Taprooted annual 2–10+ dm, freely branched at least when well developed, glabrous below, often glandular-puberulent above, the stem with an exfoliating outer layer; lvs alternate nearly throughout, linear to narrowly elliptic or lanceolate, scarcely veiny, entire or irregularly toothed, with a firm brownish apical gland, the principal ones of the main stem 2–7 cm × 2–8 mm, often soon deciduous; fascicles of reduced lvs commonly present in the main axils; racemes terminating the numerous branches, lax, few-fld; pedicels filiform, 5–20 mm; pet pink or white, 2–6 mm; stigma with 4 very short, erect lobes; fr 1.5–3 cm; seeds 1.5–2.5 mm; coma deciduous; 2n=24. Dry, open places; widespread in w. U.S., and occasionally adventive farther e., perhaps native in w. Que. and the Bruce Peninsula of Ont. Variable, with many minor named forms. (E. paniculatum)
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