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DescriptionBranched annual herb, up to 50 cm tall, erect when young, older branches becoming prostrate. Branches covered in long hairs, often mostly on one side. Leaves ovate to broadly elliptic, up to 8 × 3.5 cm, sparsely hairy on both surfaces; margins crenate-serrate. Flowers in 1-3 flowered leaf-opposed sub-sessile clusters, yellow, c. 8 mm in diameter; sepals linear, pointed, as long as the petals. Fruit a 3-5-angled capsule, usually straight, up to 4 cm long, narrowly winged at the angles angles with 3-5 spreading horns at the apex, hairless.