white clover (or Trifolium repens). According to Casey, four-leaf clovers "are as rare as the five-leaf clover, which is considered even luckier. The three-leaf clover is recognized as the genuine ...

How rare are four-leaf clovers? One thing that makes the four-leaf clover a lucky charm is its rarity. The chances of stumbling across one are typically about one in 10,000—much less likely than ...