Chickasaw plum is a native of the Southeastern U.S. and they're in bloom right now in Central Florida. Like most plums they are deciduous, and when they bloom in spring the branches are completely covered with white blossoms.
The flowers are followed by small 1/2 to 3/4 inch diameter yellow to reddish plums that are eaten by humans and wildlife alike. Fruits can be eaten fresh, made into jelly, or dried.
Prunus angustifolia has a tendency to sucker readily so it's not often used in formal landscaping but it's an ideal small tree for naturalized areas, background plantings, or mixed borders. The trees grow to about 20 foot tall in USDA Zones 5 through 9. If allowed to sucker freely, it develops more of a shrubby habit. They are very drought-tolerant once established.
The flowers are a good food source for honeybees. Supposedly butterflies are also attracted to the blooms but in my yard they bloom before the butterfly populations have started increasing in the spring.