Description from Flora of China
Herbs. Stems erect or decumbent at base, 20-80 cm, puberulous or glabrescent. Petiole 1.5-4 cm; leaf blade ovate, oblong, or lanceolate, 1.5-3.5 × 1-2.5 cm, abaxially white-gray, with sunken glands, base rounded or cuneate, margin with unicellular hairs, apex acute, rarely obtuse. Inflorescences mostly axillary, cymose panicles close together; peduncle to 2 cm. Pedicel 0.5-5 mm, with 1 or 2 lanceolate bracteoles. Perianth limb white, red, or pink, 1.5-2 mm. Stamens 2 or 3, slightly exserted. Anthocarp obconic, ca. 3 mm, glabrous, 5-ribbed, groove between ribs somewhat undulate, apex truncate, angular. Fl. and fr. summer.
Open sandy areas. Hainan (Xisha Qundao) [Indonesia, Malaysia, Singapore, Thailand, and probably elsewhere in SE Asia; Pacific Islands].