苘麻子为锦葵科植物苘麻的干燥成熟种子,秋季采收成熟果实后,晒干,打下种子,除去杂质及果皮。以颗粒饱满、色灰黑者为佳。苘麻子呈三角状肾形,长3.5~6mm,宽2.5~4.5mm,厚1~2mm。表面灰黑色或暗褐色,有白色稀疏绒毛,凹陷处有类椭圆状种脐,淡棕色,四周有放射状细纹。种皮坚硬,子叶 Gizzard is a malvaceae dry hemp plant mature seeds, harvest mature fruits in autumn, dried, lay the seeds, remove impurities and peel. To full of particles, color black is better. Psoralen was triangular kidney-shaped, length 3.5 ~ 6mm, width 2.5 ~ 4.5mm, thickness 1 ~ 2mm. Gray-black or dark brown surface, with white sparse hair, depression at the oval-shaped umbilical, light brown, surrounded by radial fine lines. Seed coat hard, cotyledons