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Stem erect, up to 1 m. high, branched sometimes from the base, the branches ascending, often the lower ones as long as or longer than the stem, rather leafy upwards, with a double indumentum of very thin, arcuate, antrorse or subpatent hairs and of numerous, yellowish, capitate-glandular, up to 1·5 mm. long setae with bulbous, blackish-violet base, finally scabrous from the persistent bases of the setae.
Flowers 2–7 per raceme, heterostylous; peduncles 3–24 cm. long, slender, with indumentum as on the stem but hairs more sparse and patent and the setae not so dense and with smaller bulbous bases; pedicels 2–7·5 mm. long, densely setose at the apex, deflexed in fruit.
Styles 10–11·5 mm. long in the longistylous flowers, with the stigmas above the anthers of the longer stamens and 2–3 mm. long in the brevistylous ones, with the stigmas below the anthers of the shorter stamens.
Calyx 11–16 mm. long, glabrous or sparsely and weakly setose towards the top; lobes c. 6 mm. long, linear-lanceolate, obtuse.
Petals c. 24 mm. long, pale yellow to orange.
Capsule (0·7)1–4(5) cm. long, glabrous.
Seeds 2–2·5 × 1–1·2 mm., obovoid.
Ovary c. 3·5 mm. long, glabrous.
An annual herb.
