Corylus avellana is a shrub to 6 m tall, often forming dense thicket of stems, young stems hairy.
Leaves alternate, to 10 long, 7 cm wide, almost round, tip abruptly pointed, base lobed, margin double-toothed, irregular, hairy on both sides, stalk to 1 cm long.
Flowers See C. americana.
Fruit as above with bracts slightly longer than nut (Dirr 1990).
Wetland status: NL.
Frequency in NYC: Very infrequent.
Habitat: Rarely escaped from cultivation.
Notes: These specimens probably planted and overgrown (R. DeCandido; Steven Glenn personal communication).