I think you're right PvR, especially with the tight bark pattern. The leaves
are a bit broader than bitternut, but then again this is in a lawn with lots
of water and fertilizer!
Scott


+ + +
Hickories don't have separate male and female trees.
I suppose you have two species here.
Maybe 019 is Carya cordiformis, bitternut? (educated guess only)
Fruits would help, or buds
PvR