G.85) CLASSIFICATION AND DESCRIPTION 149 
Genus 85. CORYLUS. 
Low trees and large shrubs with simple, alternate, de- 
ciduous, doubly serrate, straight-veined leaves. Flowers 
insignificant, in catkins in early spring. Fruit an ovoid- 
oblong bony nut, inclosed in a thickish involucre of two 
leaves with a lacerated frilled border; ripe in autumn. 
* Leafy bracts of fruit forming a bottle-shaped involucre....... 2. 
* Leafy bracts not bottle-shaped. (A.) 
A. Involucre much longer than the nut......... Babe dR ite ths 1. 
A. Involucre but little longer than the nut................. 3. 
1. Cérylus Americana, Walt. (WILD 
HaZELNuT.) Leaves roundish heart- 
shaped, pointed, doubly serrate ; stipules 
broad at base, acute, and sometimes cut- 
toothed; twigs and shoots often hairy. 
Involuere of the fruit open to the glo- 
bose nut, the two leaf-like bracts very 
much cut-toothed at the margin and 
thick and leathery at the base. Merely 
a shrub, 5 to 6 ft. high; quite common 
throughout. Cc, Americana. 
2. Cérylus rostrata, Ait. (BEAKED HazEL- 
nut.) Leaves but little or not at all heart- 
shaped; stipules linear-lanceolate. The in- 
volucre, extending beyond the nut in a bract 
like a bottle, is covered with stiff, short hairs. 
Shrub, 4 to 5 ft. high. Wild in the same re- 
gion as Corylus Americana, but not so abun- 
C. rostrata, dant. 
3. Cérylus Avellana, L. (EUROPEAN Ha- 
ZEL. FILBERT.) Leaves roundish-cordate, 
pointed, doubly serrate, nearly sessile, with 
ovate-oblong, obtuse stipules; shoots bristly. 
Involucre of the fruit not much larger than 
the large nut (lin.), and deeply cleft. A small 
tree or shrub, 6 to 12 ft. high, from Europe; 
several varieties in cultivation. ©. Avellana, 
wl 
