Quercus palustris. The swamp-oak.
1857. His [Rev. Dumpss] head is as obtuse and spongy as the butt end of a pin-oak rail, and yet you must submit to three hours of sermons sung once a week.Yale Lit. Mag., xxii. 284.
1874. Pin-oaks, whose tiny acorns are greedily sought for by mallards and sprigtails, are unknown.J. W. Long, American Wild-Fowl Shooting, p. 197. (N.E.D.)