Herbs, perennial, 30-80 cm tall. Roots numerous, thick. Branches ascending to spreading. Stipules connate on basal stems, distinct on apical stems. Leaves with 2 leaflets; petiole winged; leaflet blades obliquely ovate, 1-2 × 0.7-1 cm, glaucous, base cuneate, apex acute. Flowers axillary, solitary or paired. Pedicel 1-1.8 cm. Sepals 5, ovate to oblong, 5-8 mm. Petals orange at base, 6-10 mm. Stamens shorter than petals; appendages oblong, half as long as stamens. Capsule cylindric, ca. 3 cm × 5-8 mm, both ends obtuse. Seeds ovoid, 5-angular. Fl. Jun-Aug, fr. Jul-Sep.
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