Genus Trifolium is a group of flowering plants that belong to the Fabaceae family. These plants are commonly known as clovers, and they comprise over 300 species worldwide. However, there are several synonymous terms used for the genus Trifolium, including trefoil and shamrock. The term trefoil comes from the Latin word trifolium, which means -- having three leaves. Shamrock, on the other hand, is an old Irish term most commonly used to refer to three-leaved clovers. Other less known synonyms for Genus Trifolium include three-leaf clovers, rough clovers, three-leaved grass, and three-leafed hop clover. Despite their different names, all clovers are generally known for their association with luck and good fortune.