Corylus americana is a shrub to 3 m tall, twigs hairy, young hairs red.
Leaves alternate, broadly egg-shaped or widest above middle, finely doubly toothed, base rounded to lobed, stalk smooth, expanded mid-May (Britton 1874).
Flowers sexes separate on same plant (monoecious). Male flowers minute, dull yellow, in long catkins, on short stalks, female flowers red, very small, March (Britton 1874).
Fruit a nut enclosed in bracts to 3 cm long, with toothed margins. Nuts and catkins eaten by mammals and larger birds, twigs eaten by rabbits and deer (Martin, et al., 1951).
Wetland status: FACU-.
Frequency in NYC: Infrequent.
Habitat: Moist, undisturbed forest understory, edges and successional scrub. Soil pH 6-7.5. Tolerant of shade. Moderately tolerant of drought, soil compaction. Intolerant of salt, flooding (Hightshoe 1988).
Notes: Twigs eaten by rabbits and deer (Martin, et al., 1951).