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A plum is a fruit of the subgenus Prunus of the genus Prunus. The subgenus is distinguished from other subgenera peaches, cherries, bird cherries, etc. in the shoots having terminal bud and solitary side buds not clustered, the flowers in groups of one to five together on short stems, and the fruit having a groove running down one side and a smooth stone or pit. Mature plum fruit may have a dusty-white waxy coating that gives them a glaucous appearance. This is an epicuticular wax coating and is known as `wax bloom`. Dried plum fruits are called dried plums or prunes, although prunes are a distinct type of plum, and may have predated the fruits now commonly known as plums.