Prunus umbellata Large crops appear only every 3-4 years. Prunus umbellata Prunus umbellata, called flatwoods plum, hog plum and sloe plum, is a plum species native to the United States from Virginia, south to Florida, and west to Texas. "Prunus umbellata" can reach in height with a spread. It has alternate serrate green leaves that turn yellow in Autumn. Flowers are white, creamy, or grayish. Fruits are round, purple, and in diameter. "P. umbellata" trees can live up to 40 years and are very difficult to distinguish from "Prunus angustifolia", with which it hybridizes easily. The trees bloom and bear fruit later
Prunus subg. Padus "Padus" is polyphyletic and is therefore invalid as a genus, subgenus or anything else. In Finland and Sweden, the blooming of bird cherry ("Prunus padus", Finnish "tuomi") signifies the start of the summer for many people. In southern Finland, this normally takes place during the two last weeks of May or very early June. North Dakota State University agriculture information page about "Prunus virginiana" Prunus subg. Padus Prunus" subg. "Padus (bird cherries) is a subgenus of "Prunus", characterised by having deciduous leaves, flowers 12-30 together on slender racemes produced in late spring well after leaf emergence, and small, sour fruit