Glabrous, often mat-forming, perennial herb, with creeping stems freely rooting at nodes and numerous short erect sterile and flowering stems. Lvs alternate, sessile, densely arranged up the erect stems, imbricate but not in terminal rosettes, 4-5 × 2.5-3 mm, c. 1.5 mm thick, ± broadly cordate- ovate, convex above and below, entire, green or yellowish green but old lvs persisting and white; apex obtuse. Infl. terminal, < 1.5 cm long, a short open cyme 0.5-3 cm across and with 1-3 branches, each branch with up to 4 fls and a leaflike bract. Fls sessile or subsessile, somewhat secund. Sepals unequal, 3-4 mm long, broad-ovate and very similar to lvs. Petals 5, ± patent, 6.5-7.5 × c. 3 mm, ovate-elliptic, yellow, acute. Stamens 5-6 mm long, yellow. Carpels and styles yellow. Scales semi-lunate to ± rectangular. Follicles yellow, widely divergent. Seed 0.5-0.8 mm long, ± narrowly ellipsoid or ellipsoid-obovoid, longitudinally ribbed.