Botanical names have the distinct advantage of referring to one and only one plant, with certain exceptions. The use of these names makes communication between widely scattered gardeners and plants-men more precise. Since the internet has made the world smaller, it is important that we all refer to the same plant by the same name if our discussions are to have any meaning. If you point out a mint plant to a fellow gardener, there is understanding. If you ask me why your mint plants have little holes in them, I can surmise that snails are eating them, but I have no idea what plant you are growing since there are many genera of mints.
Genera is the plural of genus, and genus is one of the components of a plant name.
So, the genus is the basic grouping of similarity or relationship between organisms. Genus is the name given to a group of organisms whose physical characteristics are permanent, similar, and largely confined to that group. In Latin, it is a naming noun derived in part from medieval Latin, classical Latin, and Latinized versions of words in other languages, principally Greek. This is why these words may often seem foreign to you. Solanum , for example, is a Latin word for a group of plants including herbs, shrubs, trees, and vines.