Herbs, perennial, 43–50 cm, glabrous. Stems erect, unbranched proximal to inflorescence. Leaves mostly opposite, appressed-erect; stipular glands absent; blade elliptic to oblanceolate, cauline leaves 13–17 × 3–4 mm, margins entire, apex obtuse to acute. Inflorescences of few, few-flowered panicles, branches spreading-ascending, occupying to 1/4 or less of total height. Pedicels 0.5–2.9 mm, stout. Flowers: sepals persistent, inner ones broadly obovate, outer ovate, 3.1–3.6 mm, margins not scarious, inner glandular-toothed, outer entire, apex acute to acuminate; petals pale to bright yellow, ovate, 6–7 mm; stamen length unknown; anther length unknown; staminodia absent; styles distinct, 2–3.1 mm; stigmas capitate. Capsules subglobose, 2.6–3 × 2.8–3 mm, apex abruptly short-pointed, dehiscing into 10, 1-seeded segments, segments falling freely, false septa nearly complete, ± spongy, proximal margins not ciliate. Seeds not seen. 2n = 36.
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