Herbs, perennial, 60–150 cm, glabrous. Stems erect, unbranched below inflorescence. Leaves: proximal opposite, distal alternate, ascending; stipular glands absent; blade of cauline leaves narrowly elliptic or linear-oblanceolate, 23 × 4 mm, margins entire, not ciliate, apex acute or apiculate. Inflorescences panicles. Pedicels 0–2.5 mm. Flowers: sepals persistent, lanceolate or oblanceolate to obovate, 2.8–3.8 mm, inner broader, somewhat shorter than outer, margins not scarious, entire, apex apiculate; petals yellow, obovate, 8–11 mm; stamens 6 mm; anthers 0.8 mm; staminodia absent; styles distinct, length unknown; stigmas capitate. Capsules ovoid, 3.4–3.9 × 3.2–3.5 mm, apex obtuse, dehiscing freely into 10, 1-seeded segments, segments persistent on plant, falling tardily, false septa nearly complete, proximal margins very sparsely and inconspicuously ciliate. Seeds 2.8–3 × 1.2 mm.
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