The four-leaf clover is a rare variation of the common three-leaf clover that has four leaflets instead of three. According to traditional sayings, such clovers bring good luck, [1] a belief that dates back to at least the 17th century.

The four-leaf clover (officially known as Oxalis deppei) is a small plant with four distinct leaves. It’s a rare variation of the common three-leaf clover, and because your chances of finding one with four leaves is about 1 in 10,000, they’re considered lucky.