American bladdernut:
American elm:
oak (species unknown):
And two in the genus Prunus (the red one possibly Prunus persica): 
Elizabeth's Wildflower Blog
hunting in the Maryland piedmont (mostly)
American bladdernut:
American elm:
oak (species unknown):
And two in the genus Prunus (the red one possibly Prunus persica):
Elizabeth's Wildflower Blog 
I like the dainty white Prunus. What are your thoughts about crepe myrtles?
I love crape myrtles (Laegerstroemia indica) – great garden plants. Alot of work has been done by one of the local agencies (I’ve forgotten which one) to hybridize them so that they grow well in this area. They’re among the last plants to leaf out in this area, so people sometimes think they’ve died over the winter. They range from so small that they’re used as perennials to small trees; choose your cultivar carefully. But they’ve nothing to do with wildflowers. I’d be bummed if I saw one in the wild.