Catalapa speciosa (I am guessing), Bignoniaceae.
Notice bees were foraging on the back of leaves also. This is due to the many extrafloral nectaries the plant has. It attracts ants to protect the trees from caterpillars (e.g. catalpa moth).
DSCN0174 494-s
483 hits
DSCN0175
559 hits
DSCN0175 495-s
426 hits
DSCN0180 496-s
426 hits
DSD 5453
424 hits
DSD 5475
402 hits
DSD 5477
428 hits
DSD 5478
416 hits
DSD 5480
404 hits
catalpa-DSC 7551 486-s
454 hits
catalpa-DSC 7553 488-s
502 hits
catalpa-DSC 7556-25327336-O 491-s
497 hits
catalpa-DSC 7560
539 hits