The subgenus is distinguished from other subgenera -LRB- peaches , cherries , bird cherries , etc -RRB- in the shoots having a terminal bud and the side buds solitary -LRB- not clustered -RRB- , the flowers being grouped NUMBER@1 together on short stems , and the fruit having a groove running down one side , and a smooth stone .

The fruit has a groove running down one side , and a smooth stone -LRB- seed -RRB- .
