Herbs perennial, erect to ascending, branching at <± aerenchymatous> base and in inflorescence, 3–12 dm. Stems: internodes 4-lined. Leaves ascending to appressed, sessile; blade usually lanceolate, rarely elliptic to ovate, 5–20(–24) × 5–15 mm, <shorter than internodes, smaller distally>, leathery, margins plane, apex acute, <gland-dotted, less conspicuously adaxially>, basal veins 1–5, midrib with 2–3 pairs of branches. Inflorescences corymbiform, to 30-flowered, branching mostly dichasial. Flowers: 5–13 mm diam.; sepals lanceolate, unequal, 3.5–4.2(–4.8) mm, <margins sometimes ciliate, not setulose-ciliate>, apex acute to subacuminate; petals orange-yellow, ± obovate, 5–10 mm; stamens 50–80, filaments basally connate; styles 2–4 mm; stigmas clavate. Capsules ovoid, 3–4.5 mm. Seeds 0.4–0.7 mm; testa reticulate.
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