Very slender herb, glab. or nearly so; stems us. much-branched, creeping, rooting at nodes, forming us. dense patches up to c. 2 dm. diam. Lvs on filiform petioles ± 1 mm. long. Lamina ± 4-6-(10) × 2-4-(6) mm.; delicate, of diverse size and shape (often several forms on same plant), elliptic to lanceolate to narrow-oblong to obovate; margins entire to obscurely or sts distinctly denticulate; obtuse to sub-acute. Fls (6)-8-9-(12) mm. long, on filiform peduncles up to 10 mm. or more long. Calyx-lobes very narrow-triangular to filiform, ± 3 mm long. Corolla pale blue to white; tube entire; lobes linear-oblong; stamens inserted at c. mid-tube; 2 lower anthers awn-tipped. Capsule turbinate, ± 3-5 mm. long.