Plant morphology
Annual herb, 20-80cm high, with aromas throughout the plant. Stems erect, many clustered, sparsely hairy. Three leaves of compound leaves alternate; leaflets long ovate or ovate-lanceolate, 1-3.5cm long, 0.5-1.5cm wide, trichomes on both sides; petiole long, stipules and petiole commissure. Flowers sessile, 1-2 buds axillary; calyx tubular; corolla butterfly-shaped, white, later faded yellowish, base purplish; stamens 10, 2 body; ovary linear. The pods are slender, flat cylindrical, slightly curved, 6-11 cm long, and 0.5 cm wide, with veins and pilose furrows, and a long beak at the tip. 10-20 seeds, brown, with aroma. Flowering from April to June, fruiting period from July to August. More cultivation. China's main producing areas are Qinghai, Ningxia, Gansu, Anhui, Sichuan and Henan.
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