Perennials to 60 cm tall but usually less, glabrous except sometimes for abaxial surface of young leaves, petioles, and mouth of corollas. Stems creeping. Branchlets 4-angled when young, becoming terete. Interpetiolar stipules reduced to a narrow rim, often with a few small slender lobes on each side. Petiole 1--2 cm; leaf blade lanceolate to oblanceolate, sometimes slightly oblong, 5--15 X 2--5 cm, membranous to papery, base cuneate, apex acuminate to obtuse, lateral veins 8--10 pairs. Cymes terminal or axillary, 3-branched, many-flowered; peduncle 3--7 cm; bracts and bracteoles narrowly elliptic, ca. 1 mm. Pedicel 1--3 mm. Calyx lobes narrowly ovate, ca. 1 X 0.5 mm. Corolla white, urceolate, tube ca. 1.5 mm; lobes ovate, ca. 0.5 mm. Stamens inserted near corolla mouth. Ovary subglobose, smooth. Styles ca. 0.5 mm, free to base; stigma capitate. Capsules subglobose, 2--2.5 mm in diam., apex horned straight and divergent. Seeds brownish, glabrous, tuberculate. Fl. Mar-May.
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