Herbs erect or ascending, with rooting, creeping, branching base, 0.5–6.6(–8) dm. Stems: internodes usually weakly 2-lined, sometimes not lined, without black glands, <rarely with reddish glands>. Leaves usually spreading, rarely erect, sessile or (proximal) subpetiolate; blade oblong-elliptic or elliptic to triangular-ovate or (proximal) obovate, 12–28(–32) × 6–15(–18) mm, base subcordate to rounded or (proximal) cuneate, margins plane, apex obtuse to rounded, midrib with 4–5 pairs of branches, <tertiary veins not densely reticulate>, black glands intramarginal (± dense) and, rarely, (1–2) laminar (distal). Inflorescences cylindric to narrowly pyramidal, (1–)8–20-flowered. Flowers 6–15(–25) mm diam.; sepals not or scarcely imbricate, erect in fruit, ovate to lanceolate or narrowly oblong, unequal to subequal, 2.5–5.5 × 1–2 mm, apex acute to rounded; petals golden yellow, <sometimes red-tinged>, oblanceolate, 7–12 mm; stamens 50–90(–109); anther gland black; styles 2–8 mm. Capsules oblanceoloid, 6–10 × 3.5–6 mm, with longitudinal vittae. Seeds not carinate, (0.5–)0.7–0.8 mm; testa linear-reticulate. 2n = 16.
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