BETULACEAE: Composite Family
KEY TO SPECIES OF CORYLUS
1. Twigs and petioles usually bearing gland-tipped hairs; the 2 broad leaflike fruiting bracts 13-32(42) mm, margins cut into narrow sharp lobes, these bracts often united but never fully on at least one side ............... C. americana
1. Twigs and petioles hairy but none gland-tipped: the 2 fruiting bracts mostly 40-70 mm, fused and forming a beak long beyond the nut ............... C. cornuta