Herbs, erect to ascending, annual or perhaps perennial; stems 4-angled to subterete or sulcate, glabrous or sparsely puberulent. Leaves subsessile or petiolate; petiole to 3 mm, glabrous; blade drying papery, lanceolate to ovate-lanceolate or lanceolate-elliptic, 1-3.5 × 0.5-1.5 cm, adaxially sparsely scaberulous to puberulent, abaxially glabrous or puberulent to scaberulous on principal veins, base cuneate to acute, margins ciliate to scaberulous, apex acute to acuminate; secondary veins 3 or 4 pairs; stipules broadly triangular, 1-3 mm, glabrescent, subentire or with 1 or 3 bristles to 1 mm, entire or ciliate. Inflorescences axillary and/or terminal, 1-flowered or cymose, several flowered, and dichotomous, glabrous; peduncles 0.5-2.5 cm; pedicels to 7 mm. Flowers sessile to pedicellate. Calyx glabrous; hypanthium portion obconic, ca. 0.8 mm; limb divided essentially to base; lobes triangular, 0.5-1.3 mm, entire to ciliolate, acute. Corolla white, pale pink, or pale purple, tubular to tubular-funnelform, outside glabrous; tube 1.5-2 mm, apparently glabrous in throat; lobes triangular to lanceolate, 0.5-1 mm, obtuse to acute. Capsule compressed globose, 1.5-2 × ca. 3 mm, glabrous. Fl. Sep-Oct.
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