Herbs, perennial, procumbent, much branched, mat-forming. Stems up to 30 cm, 4(or 6)-angled, glabrous, smooth or sometimes with scattered (very rarely more dense) short and straight hairs. Leaves in whorls of up to 6, sessile; blade drying papery and blackish, linear-oblanceolate to narrowly elliptic-oblanceolate, 2-8.5 × 0.3-1.5 mm, glabrous and smooth, occasionally with straight hairs, base cuneate, margins flat to thinly revolute, very rarely antrorsely aculeolate, apex acute, ± contracted and mucronate; vein 1. Inflorescences with terminal and axillary cymes, 1-to few flowered; peduncles (1.5-)3-8(-10) mm; pedicels (0.1-)0.5-2(-3) mm, glabrous, smooth. Ovary ellipsoid-obovoid, ca. 0.5 mm, didymous, glabrous. Corolla white, pale greenish, or yellowish, rotate, 1.2-3.5 mm in diam., glabrous to puberulent, lobed for 2/3 or more; lobes 4, lanceolate-spatulate, inside (i.e., adaxially) papillose, shortly acuminate. Mericarps ellipsoid, ca. 1 × 0.4-0.6 mm, glabrous, smooth or granular-verruculose, often on elongating pedicels. Fl. and fr. Jul-Oct.
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