Weedy annual; stems much branched, to 7 dm, minutely glandular-hairy, especially upwards; lvs 1.5–6 × 0.5–2.5 cm, oblong to elliptic or ovate, with ± evident lateral veins; pedicels 3–5 mm; cal 3–5 mm, 5–9 mm in fr, becoming inverted at maturity so that the 3 long teeth are lowermost; cor-tube about equaling the cal, the lobes 3–6 mm; filaments finally to 15 mm; nutlets glabrous, 1.5–3 mm; 2n=38. Dry soil, upland or sandy woods, and old fields; Me. to Mich. and Mo., s. to Fla. and Tex. Aug., Sept.
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