Herbs, perennial, lower stems decumbent and upper stems apparently ascending; stems terete to 4-angled, glabrous to hirtellous in lines or throughout, angles sometimes thickened. Leaves petiolate; petiole 1-5 mm, glabrous to hirtellous or hispid; blade drying papery, ovate, lanceolate, or elliptic, 1-5.5 × 0.5-2 cm, adaxially glabrous or sparsely to moderately strigillose, scaberulous, or hirtellous, abaxially densely hirtellous or glabrous except sparsely strigillose or puberulent on principal veins, base rounded to cuneate, apex acute; secondary veins 3-5 pairs; stipules rounded to triangular, 1-2 mm, glabrous to hirtellous, laciniate to setose, lobes or bristles 3-7, 0.5-5 mm, glabrous to ciliate. Inflorescences terminal and/or pseudoaxillary, laxly cymose, branched to 2 or 3 orders often asymmetrically, with flowers borne separately or in glomerules of 2-5, glabrous or hirtellous; peduncle 0.8-3 cm; bracts laciniate or stipuliform, 0.5-2 mm. Flowers sessile or subsessile, floral biology unknown. Calyx glabrous to densely hirtellous; hypanthium portion obconic, ca. 1 mm; limb divided essentially to base; lobes linear-lanceolate, 1-2 mm. Corolla white, funnelform, outside glabrous; tube 3.5-4 mm, puberulent or perhaps pubescent inside; lobes ovate to triangular, 2.2-3 mm. Capsule compressed globose, 2-2.5 × 2.5-3 mm, glabrous to hirtellous. Fl. and fr. Jun-Oct.
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A small herb. It keeps growing from year to year. It has a bad smell when crushed. The stems lie along the ground and have thin hairs. The stems are green with some tinges of red and form roots at the nodes. The stems are 15-75 cm long. The leaves are opposite and have short stalks. They are oval and dark green above and more pale underneath. They are 1-5 cm long by 1-3 cm wide. The leaf stalks have a furrow and narrow wings. The flowering shoot are in the axils of leaves with 2-10 flowers. The flowers are small and funnel shaped and yellowish-white. The fruit is a flattened capsule 2-3 mm across. They have many small seeds.
Sunny or somewhat shady, humid places, often as a weed in tea or coffee plantations; at elevations from 800-2,100 metres. Wet sites at streamsides or in forests; at elevations from 500-1,000 metres in southern China.
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A tropical plant. In Indonesia it grows from 700 m above sea level into the high mountains. It is best is humus rich soil. It grows in wet sites near streams and in forests between 500-1,000 m above sea level.
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