Perennial herb 0.25–0.6 m tall, erect, not rooting (or, fide Kerner, base creeping and stoloniferous), with stems few to several, unbranched below inflorescence. Stems narrowly 2-lined above, terete below; internodes 20– 40 mm, mostly exceeding leaves, lowermost shorter than them. Leaves sessile, not amplexicaul; lamina 15–40 × 12–30 mm, broadly elliptic-ovate or oblong-ovate to ovate-lanceolate, paler beneath, thinly chartaceous; apex rounded, margin plane, entire, base truncate to shallowly subcordate; venation: 3 pairs of main laterals from lower 2/5 of midrib, branching, with rather dense tertiary reticulation; laminar glands pale and black, rather dense; intramarginal glands black, irregular. Inflorescence 6–25-flowered, from 2(3) nodes, the uppermost internode short, without flowering branches below, the whole obconic; pedicels 1.5–2 mm; bracts foliar, bracteoles linear-lanceolate, glandular-ciliate. Flowers c. 15 mm in diam., stellate; buds ellipsoid, rounded. Sepals 5, subequal, free, 4–7 × 1–3 mm, narrowly oblong to linear-lanceolate, subacute to acute, glandular-ciliate to shortly fimbriate, erect in fruit?; veins 3(4), unbranched or branching outwardly, slightly prominent; laminar glands all black or a few pale, basally linear to distally punctiform; marginal glands black, on cilia. Petals 5, bright? yellow, not tinged red, 10–14 × 4–5 mm, 2–2.5 × sepals, narrowly obovate to oblanceolate, rounded; laminar glands black, shortly linear to punctiform, scattered; marginal glands black, distal, on cilia. Stamens c. 30 or more, longest c. 8–10 mm, 0.7–0.8 × petals. Ovary 2.5–3 × 1.5–2 mm, ovoid; styles 5–6 mm, 2–2.5 × ovary. Capsule 4–6 × 3.5–4.5 mm, broadly ovoid; valves with glands pale, scarcely prominent, shortly elongate vittae to round orange vesicles. Seeds stramineous?, 1.1–1.3 mm; testa ribbed.