Herbs, perennial (flowering 1st year), 25–70 cm, glabrous. Stems erect, usually multiple from base, sometimes 1, unbranched or few-branched proximal to inflorescence, slender, wiry, prominently ribbed in inflorescence. Leaves early deciduous, alternate or basalmost opposite, appressed-ascending; stipular glands present, reddish, becoming dark; blade linear, 5–15 × 0.5–1.2 mm, margins entire or with scattered minute marginal glands, not ciliate, apex acute; 1-nerved. Inflorescences cymes. Pedicels 0–2 mm. Flowers: sepals persistent, lanceolate to ovate or inner ones sometimes obovate, outer sepals 2.5–3.6 mm, margins hyaline, not scarious, all glandular-toothed, apex acuminate; petals yellow, obovate, 4–6.5 mm; stamens 3 mm; anthers 0.3–0.7 mm; staminodia present or absent; styles distinct, 2–3 mm; stigmas capitate. Capsules pyriform, 2–2.5 mm diam., apex pointed, dehiscing readily into 10, 1-seeded segments, segments falling freely, false septa incomplete, margins of septa ciliate. Seeds 1–1.5 × 0.6–1 mm. 2n = 36.
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