Slender herb with adventitious roots from upward-growing mostly buried main stem. Lateral branches few or many, us. rather flaccid, some forming new rosettes, some ± branched and ending in infls. Lvs on short main stem with elliptic to broadly oval lamina 6-12 × 3-6 mm., petiole very slender, occ. up to 4 cm. long; hairs short and closely appressed, evenly and sparsely distributed on upper surface, few on undersurface. Flowering branches 2-40 cm. long, internodes us. longer, sts much longer, than lvs; petioles progressively shorter in upper lvs, bracts almost sessile; laminae elliptic to broad-elliptic, hairs as on lvs of main stem. Cyme us. elongated, simple or branched, us. several-fld, internodes us. long with each fl. clearly opp. its bract. Pedicels c. = calyx, sts 5-10 mm. long in fr. Calyx 1*5-3*5 mm., lobes > 1/2 length, narrow and acute, hairs short, closely appressed, evenly and us. sparsely arranged. Corolla white or with yellow throat, 3-4 mm. diam., tube 2 mm. long, cylindric, lobes rounded c. 1 × 1mm.; filaments very short, anthers < 1 mm. long, us. wholly included; style little > calyx, stigma capitate. Nutlets 1·75 × 1·5 mm., acute, projecting from short widely open calyx.

Diffuse herb; branches slender, rooting at nodes, usually rather flaccid. Lvs elliptic to broadly ovate, on very slender petioles; hairs short, closely appressed, even and sparse, few abaxially. Upper lvs > to much > internodes. Cymes simple or branched, several-flowered; internodes long; each fl. opposite its bract. Calyx hairs stiff, short, closely appressed, even and sparse. Corolla white to yellowish, 3-4 mm diam.; tube short, cylindric; filaments very short; anthers usually wholly included.