Plant: Annual, mat-forming, glabrous; stem prostrate, slender, diffusely branched from base, forming leafy mats < 10 cm Leaves: of a pair unequal, opposite; stipule sheathing stem, scarious, fringed, attached to lower petiole margins; petiole ± = blade; larger blades 5-10 mm, elliptic, obtuse; axil of smaller leaf with short stem, flower, or both Inflorescence: flower solitary in axil; bracts fringed Flowers: ± 2 mm diam; calyx bell-shaped, lobes 4-5, unequal, calyx lobes ± 1.5 mm; erect, ovate, margin scarious; ovary superior, ovoid to round, chamber 1, placenta free-central; styles and stigmas generally 2 Fruit: ± round capsule, circumscissile, thin-walled; seeds many, ± 0.3 mm, round-reniform, smooth, brown; aril slender, persistent on placenta Misc: Seasonally dry margins of wetlands; < 1000 m.