Perennial herb 0.2-0.6(-1) m tall, erect or rarely decumbent to procumbent from creeping and rooting base, budding on roots late in season, with stems numerous to few, much branched especially distally. Stems 2-lined, with few black glands on lines; internodes 5-25 mm, shorter than leaves. Leaves sessile to 1 mm petiolate; lamina (5-)10-25(-30) ´ 3-10 mm, oblong or elliptic to linear or rarely orbicular, paler beneath, chartaceous; apex obtuse or apiculate to rarely acute, margin plane or ± recurved to revolute, base subcordate (or rarely cordate)-amplexicaul to rather narrowly cuneate; venation: c. 2 pairs of main laterals from lower quarter to eighth of midrib, tertiary reticulation lax or scarcely visible; laminar glands pale, scattered and sometimes black, few, punctiform; intramarginal glands black, spaced, interspersed with small dense pale ones. Inflorescence 3- to numerous-flowered, from 1-3 nodes, with flowering branches curved-ascending from up to 15 or sometimes more nodes below, the whole cylindric to broadly pyramidal or subcorymbiform; pedicels c. 0.5-2 mm; bracts and bracteoles up to 4(-7) mm long, narrowly lanceolate to linear, entire. Flowers 15-25(-35) mm in diam., stellate; buds narrowly ovoid, acute. Sepals 5, equal, 3-7 ´ 0.7-1.5 mm, narrowly oblong or lanceolate to linear, acute to finely acuminate with acumen sometimes glandular, entire, erect in bud, recurved in fruit; veins 3(5), unbranched; laminar glands pale and often a few black, in 2(4) rows, striiform (basally) to punctiform; intramarginal glands few, black or absent. Petals 5, golden yellow, not tinged red in bud, (8-)12-15 ´ 5-6 mm, 3-4 ´ sepals, oblong to oblong-elliptic, asymmetric, distally ± crenate; laminar glands all pale to mostly black, linear or partly striiform to punctiform; intramarginal glands black, distal, in sinuses when present. Stamens 40-60, '3'-fascicled, longest 6-8 mm, c. 0.5-0.7 ´ petals; anther gland black. Ovary 3-locular, 3-5 ´ 1.3-1.8 mm, narrowly ovoid to ovoid-ellipsoid; styles 3, free, 4-6 mm, c. 1.5-2 ´ ovary, broadly to rather narrowly spreading; stigmas narrow. Capsule 3-10 ´ 3-6 mm, 0.7-1.5 ´ sepals, narrowly to broadly ovoid or narrowly ovoid-conic; valves with dorsal vittae and lateral vittae or yellowish, striiform to punctiform vesicles. Seeds dark brown, c. 1mm, cylindric, not carinate or appendiculate; testa finely linear-foveolate.
See Salisbury (1`942: 106), Hagemann (1983: 106, f. 3 and refs.).