Bushy shrub, 1.-21.8 m (in Sumatra), with arching, sometimes frondose branches; branchlets 4-lined or 4-angled when young, eventually becoming 2-lined or terete. Leaves subsessile or up to ½ mm petiolate, 1-4½ by ½-2½ cm, lanceolate to ovate, apex acute to rounded-apiculate, base narrowly or rarely broadly cuneate, very glaucous below; 3 main lateral veins, with scarcely visible lax reticulate venation; glands all pale, shortly striate towards midrib, otherwise punctate. Inflorescence l-3(-10)-flowered, terminal (1-2 nodes), corymbose, and often also lateral, racemi-form. Flowers 1½-3 cm Ø ± concave; buds broadly ovoid to globose, obtuse to rounded. Sepals 3½-9 by (1-)2-6½ mm, free, ± imbricate, oblong or elliptic to obovate-spathulate, rounded, entire, midrib invisible or almost so; spreading or ascending in flower, ascending in fruit; glands all pale, linear. Petals bright yellow to golden yellow, 9-18 by 5-12 mm, broadly obovate to obovate-circular, entire, caducous; apiculus distinct to obscure, ± rounded; glands all pale, linear. Stamen fascicles 5, 4-6(-8) mm long, c. ¼-½ as long as petals, each with 40-60 stamens, caducous; anthers bright yellow to orange-yellow, gland amber. Ovary 3-5 mm, ovoid to globose; styles 5, 2½-4½ mm, (0.6-)0.7-0.9 times as long as ovary, partially or wholly outcurving, free; stigma narrowly capitate; placentae 5, axile. Capsule 7-11 mm, subglobose to globose. Seeds dark brown, c. ½ mm, cylindric-ellipsoid, not curved, slightly carinate, shallowly linear-reticulate.
Grassy or rocky slopes, pastures, thickets, open woodland and montane forest, 1700-3300 m.
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