Herbs, perennial, erect, often reduced, 5-12(-20) cm tall. Stems 4-angled, sparsely to moderately pilose becoming glabrescent, angles thickened. Leaves in whorls of 4, sessile to subsessile; blade drying membranous, ovate, elliptic, or broadly lanceolate, 4-10 × 2-5 mm, length/breadth index 2-3, both surfaces sparsely hirsute at least along midrib, base cuneate to obtuse, apex acute to obtuse, sometimes apiculate; principal vein 1, 2 lateral veins weakly developed. Inflorescences terminal and in upper leaf axils, with cymes 2-to several flowered, 2-16 mm, shorter to somewhat longer than subtending leaves; peduncles glabrescent, bracteate; pedicels 0.8-4 mm. Flowers hermaphroditic. Ovary obovoid, ca. 0.5 mm, densely appressed hairy. Corolla white, rotate, 2-2.5 mm in diam., lobed for 1/2-2/3; lobes 4, ovate. Fruit on pedicels becoming deflexed to nodding; mericarps obloid to oblate, 0.8-1 mm, densely grayish yellow hairy with straight or slightly curved trichomes ca. 0.8 mm. Fl. Jul, fr. Aug-Sep.
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