Perennial herb 0.2-0.8 m tall, erect or decumbent but not rooting at base, with woody taproot, few-stemmed, unbranched below inflorescence or with short axillary shoots after fruit ripens, shortly whitish-pubescent on stems below inflorescence and on both leaf surfaces. Stems green, terete; internodes all shorter than leaves or upper (or more rarely all) exceeding them. Leaves sessile; lamina 15-45(-55) x 8-20(-22) mm, ovate to oblong or elliptic, paler beneath, thinly chartaceous, not glaucous, shortly pubescent beneath, usually shorter or puberulous above, plane, spreading; apex rounded, margin entire, base cordate-amplexicaul to rounded; venation: 3 pairs of laterals curved-ascending from lower 0.2-0.25 of midrib, tertiary reticulation dense, not or scarcely prominent; laminar glands all pale or sometimes scattered black ones distally and towards margin, dense to rather sparse, unequal; intramarginal glands black, dense to rather sparse. Inflorescence (12-)15-c. 200- flowered from (2-)5-8 nodes, without flowering branches from lower nodes, cylindric to rarely shortly and broadly rounded-pyramidal; pedicels 2-3 mm; bracts and bracteoles triangular-lanceolate to linear, black-glandular-ciliate, often with basal cilia somewhat longer but not auriculate. Flowers 15-20 mm in diam.; buds cylindric, rounded. Sepals 3.5-5 x 1-2.2 mm, subequal, free or almost so, narrowly oblong or oblong-lanceolate to elliptic or rarely lanceolate to ovate, obtuse (rarely acute) to rounded, with margin long-glandular-ciliate; veins 3, outer sometimes branched; laminar glands pale, striiform; marginal glands black, flat-topped. Petals pale yellow, not tinged red, (8-)9-12 x 3-3.5 mm, c. 2.5 x sepals, elliptic to oblanceolate, rounded, apiculus absent; laminar glands pale, punctiform to striiform, and also usually black, punctiform, scattered; marginal glands absent. Stamens 25-40, longest 6-8 mm, c. 0.65 x petals; anther gland black. Ovary 1.5-3 x 1-1.5 mm, ellipsoid; styles 3.5-5.5 mm, 1.9-2.3 x ovary, spreading-incurved. Capsule 5x3 mm, broadly ellipsoid, equalling or exceeding sepals, enclosed when developing by petals twisting together. Seeds dark reddish brown, 0.5-0.6 mm long; testa finely scalariform.