蛇床（学名：Cnidium monnieri）为伞形科蛇床属的植物。

一年生草本；茎多分枝；叶三回三出式羽状全裂，最终裂片线形；夏季开白色花，复伞形花序；卵圆形双悬果，翅状果棱。

Cnidium monnieri (L.) Cusson ex Juss., Monnier's snowparsley, is a flowering plant species in the genus Cnidium. Also known as Shechuangzi, Osthole, Jashoshi, Cnidii Fructus (Fruits of Cnidium) Do not confuse with Bacopa Monneri, Cnidium Officinale, (both similar but different plants) The coumarins osthol, imperatorin and xanthotoxol can be found in C. monnieri.