Herbs, summer annual, ± glaucous. Cotyledons lanceolate. Leaves numerous; petiole 1.5-8 cm, shortly and broadly vaginate at base; blade narrowly oblanceolate, 5-20 × 1-3 cm, pinnate; primary leaflets 4-9 pairs, broadly ovate, 0.4-2 cm, almost sessile, pinnatifid; lobules lanceolate, ovate, or narrowly elliptic to obovate, 2-4 mm, apex acute. Flowering stems few to many, 5-40 cm, dichotomously branched; bracts paired, 0.5-3 cm, lower ones biternate to sub-bipinnate, gradually smaller and less divided upward, uppermost linear. Sepals green, ovate or ovate-lanceolate, 2-3(-4) × 1-1.5(-2) mm, margin membranous, entire, rarely toothed. Petals white or pale lavender, apically green (in type description Hypecoum chinense said to have yellowish flowers); outer petals obovate, 6-9 × 4-6 mm, entire; inner petals 3-parted to less than 1/2; lateral lobes broadly oblong, apex obtuse; middle lobe spatulate-orbicular, ca. 2 mm, shortly stalked or sessile, margin incurved, almost entire or slightly denticulate. Stamens with obscure nectaries; anthers 1-1.5 mm. Ovary with up to ?20 ovules. Capsule erect, linear, 3-4 cm × 1-1.5 mm, breaking up into 15-18 segments when mature, each segment with 1 seed. Seeds flattened, D-shaped. Fl. and fr. Jun-Sep. 2n = 42.
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A herb. It grows each year from seed. It has many leaves. They are narrowly sword shaped. They are 5-20 cm long by 1-3 cm wide. There are 4-9 pairs of leaflets. The flowering stems are 5-40 cm long.
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