Quercus robur is a tree in white oak group. Bark deeply furrowed, blackish.
Leaves alternate, small to 12 cm long, 6 cm wide with rounded lobes, widest above middle, but usually narrower than native oaks; leaf base lobed; stays green into Nov.-Dec, long after native oaks are brown or leaves fallen.
Flowers monoecious, males in catkins.
Fruit acorns to 5 cm, cap covers 1/3 nut, stalks to 10 cm (the only other long stalked acorns are Q. bicolor)
Wetland status: NL.
Frequency in NYC: Very infrequent. Rarely escaping in NYC.