Catalpa, Catalpa spp.
Catalpas are tall trees with large yellow-green heart shaped leaves (see photo below). The overall shape can be rectangular and irregular or neat and cultivated. The flowers bloom in June. One beekeeper I met said he knew the tree from its “cigars,” or seed pods.
Honey bees will visit leaves and flowers of the catalpa. There are nectaries on the underside of catalpa leaves (see here) — darker, wet looking areas in the crotch of veins.
The flowers are large enough for bees to crawl inside and get nectar.