Prunus pumila L.  
Family: Rosaceae
sand cherry
[Cerasus pumila (L.) Michx.]
Prunus pumila image
from USDA Plants website  
Prunus pumila image
Hugh H. Iltis  
Prunus pumila image
Merel R. Black  
Prunus pumila image
from USDA Plants website  
Prunus pumila image
Hugh H. Iltis