Herbs, annual, 10–50 cm, puberulent near base, otherwise glabrous. Stems stiffly ascending-spreading, few to many-branched. Leaves alternate, appressed; stipular glands present at basal nodes or throughout; blade linear, 7–20 × 0.5–l.9 mm, margins entire, not ciliate, apex aristate. Inflorescences racemes. Pedicels 3–15 mm. Flowers: sepals deciduous, lanceolate to narrowly ovate, 4–7 mm, margins scarious, delicately glandular-toothed, apex aristate; petals yellow to yellow-orange throughout, oblanceolate to narrowly obovate, 5–10 mm; stamens (3–)4–7 mm; anthers 0.4–1 mm; staminodia present or absent; styles connate nearly to apex, 2–5.7 mm; stigmas green, capitate. Capsules ovoid, 3.2–4.5 × 2.5–3.4 mm, relatively thick-walled and with characteristic thickened areas at apex in region of true septa, apex obtuse, dehiscing into 5, 2-seeded segments, segments persistent on plant, false septa complete, proximal part membranaceous, not terminating in loose fringe, distal part cartilaginous, margins ciliate. Seeds 2–3 × 0.8–1.3 mm.
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