Height - 10–40 cm (4–16 in.). Often with many stems. Stem ascending–erect, glabrous–with glandular hairs, often sticky. Internode below inflorescence shorter than lower ones.
Corolla regular (actinomorphic), white, approx. 1 cm (0.4 in.) broad; petals five, 3.5–5 mm (0.14–0.2 in.) long, slightly longer than sepals. Sepals 5, with glandular hairs, membranous margins. Stamens usually 10 (sometimes 5). Gynoecium syncarpous, with 5 styles. Inflorescence a many-branched cyme.
Opposite, but apparently whorled, stalkless, stipulate, erect–spreading. Blade thread-like–linear, with entire margins, semi-cylindrical, underside grooved, quite fleshy, with glandular hairs, lime–dark green. Lowest leaves around same length as internodes. Stipules membranous, thin, dropping early.