Herbs, perennial, procumbent and mat-forming. Stems (5-)14-30(-45) cm, 4-angled or-sulcate, branched, glabrous and smooth, but sometimes with scattered straight hairs. Leaves in whorls of up to 6, sessile; blade drying papery, blackish, linear-lanceolate to narrowly oblanceolate, 2.5-10.5 × 0.4-1.4 mm, with inconspicuous epidermal cells, glabrous and smooth, rarely with a few straight hairs on abaxial midvein, base cuneate, margins entire and smooth, flat to thinly revolute, apex acute, contracted and shortly mucronate; vein 1. Inflorescences with predominantly axillary cymes, 1-6-flowered; axes glabrous, smooth; pedicels 0.1-3.2 mm. Ovary ellipsoid-obovoid, ca. 0.5 mm, glabrous, smooth. Corolla red, purple, or occasionally white, rotate, 1.7-3.6 mm in diam., glabrous to papillose; lobes 4, lanceolate-spatulate, adaxially glabrous except puberulent on margins and central vein, apex acute to shortly acuminate. Mericarps ellipsoid, ca. 1.5 × 0.7 mm, glabrous and smooth or granular-verruculose, on pedicels often elongating to 5 mm. Fl. and fr. Jun-Nov.
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