Small herb, often mat-like, probably always annual; stems glabrous or slightly scabridulous with retrorse hairs, terete to bluntly 4-angled, slender or filiform, usually < 20 cm tall. Lvs and stipules in whorls of 4-(6), ± sessile or with petiole to 1 mm long; lamina 1.5-6 × 0.5-1.8 mm, linear-lanceolate, narrow-elliptic, oblanceolate to obovate, glabrous or ± scabridulous above and on midrib below; margins antrorsely ciliate, often revolute; apex shortly awned. Fls 1-2, in axillary cymes; peduncles 0; pedicels to 1 mm long, puberulent, deflexed at fruiting; bracts leaflike. Corolla c. 0.5 mm diam., pinkish in bud, later whitish; lobes ovate, incurved and appearing ± obtuse. Mericarps 1-1.8 mm long, cylindric-oblong, often curved, puberulent, with apical tuft of hooked bristles and usually hooked bristles elsewhere, commonly 1 mericarp with some bristles, the other with few or none.
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