酢浆草（学名：Oxalis corniculata），又称三叶酸、山盐酸、蝴蝶翼、黄花酢酱草、盐酸草，为酢浆草科酢浆草属下的一个种。

Oxalis corniculata, the creeping woodsorrel, also called procumbent yellow-sorrel or sleeping beauty, resembles the common yellow woodsorrel, Oxalis stricta. It is a somewhat delicate-appearing, low-growing, herbaceous plant in the family Oxalidaceae. It has a narrow, creeping stem that readily roots at the nodes. The trifoliate leaves are subdivided into three rounded leaflets and resemble a clover in shape. Some varieties have green leaves, while others, like Oxalis corniculata var. atropurpurea, have purple. The leaves have inconspicuous stipules at the base of each petiole.