Plants glabrous or nearly so throughout except for scabrous angles of stems. Stems simple or branched, slender and often weak, 15-60 cm tall. Leaves ovate to ovate-elliptic or obovate-lanceolate, 6-20 mm, margin entire, or inconspicuously crenate-serrate with very short and broad teeth, base usually rounded, not amplexicaul. Earlier flowers with 3 or 4 ovate to lanceolate calyx lobes; later ones with 4 or 5 longer, lanceolate-subulate calyx lobes. Capsule oblong-cylindric, 6-10 mm, opening by valves close under calyx lobes. Fl. and fr. Apr-Jul. 2n = 28, 56.
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