Shrub 0.5-1 m tall, densely and divaricately branched below, bushy, with branches erect to ascending, the whole plant (usually except stems) glabrous. Stems red-brown, compressed (sometimes shallowly 2-lined) and densely villous-tomentose or rarely sparsely puberulous to glabrous when young, soon terete, eventually glabrous; internodes shorter than leaves; cortex exfoliating in usually internodal sheets; bark dark red-brown, smooth. Leaves sessile; lamina 10-25 x 3-12 mm, narrowly elliptic or narrowly oblong to broadly triangular-lanceolate, concolorous or slightly paler beneath, chartaceous, not or slightly glaucous, glabrous, plane, spreading or somewhat deflexed; apex acute to subacute, margin entire, base cordate to rarely rounded and deeply amplexicaul; venation: 2(3) pairs of laterals curved-ascending from lower 0.25(-0. 35) of midrib, tertiary reticulation dense and manifest but not prominent; laminar glands pale, dense to rather sparse, unequal, prominent; intramarginal glands all black or a few pale, dense but sometimes irregular. Inflorescence c. 5-40-flowered from up to 3 nodes, without flowering branches from lower nodes, curved corymbiform and dense or rarely lax and rounded-pyramidal; pedicels 2.5-4 mm; bracteoles (and bracts at uppermost 2-3 nodes) narrowly triangular-lanceolate to linear, with rather sparse black-glandular cilia. Flowers c. 15-20 mm in diam.; buds narrowly ellipsoid, acute. Sepals 3.5-6 x 1-2 mm, subequal, free or to c. 0.15 united, lanceolate to narrowly oblong, acute to subacuminate, with sessile marginal glands or margin glandular-ciliate; veins 3, laterals branching; laminar glands pale, striiform to usually punctiform; marginal and inframarginal glands black, round- or flat-topped, immersed to sessile or on short (rarely long) cilia. Petals rather pale bright yellow, not tinged red, 10-12(-14) x 4-5 mm, c. 2.5 x sepals, oblong-oblanceolate, obliquely truncate to rounded, apiculus obsolete or absent; laminar glands pale, few, linear (rarely) or striiform to punctiform; marginal and inframarginal glands all black or some pale, not prominent. Stamens c. 25, longest 9-10 mm, c. 0.8-0.9 x petals; anther gland amber. Ovary 2-2.5 x 1-1.5 mm, narrowly ovoid; styles 6-7 mm, c. 3 x ovary, widely spreading-incurved. Capsule 4-5 x 2.5-3.5 mm, ovoid-ellipsoid, shorter than or equalling sepals, enclosed by petals twisting together. Seeds yellow-brown, c. 0.6 mm long; testa shallowly linear-foveolate.