Apple (Malus) 2016-4-14 Newark, DE
same tree as in 4/7/16 photo
I thought it was Japanese Flowering Crab Apple (Malus floribunda) but have found a photo of the flowers that puts a crimp in that ID:
http://calphotos.berkeley.edu/cgi/img_query?enlarge=0000+0000+0316+3253