48 KEYS TO THE GENERA 



A. Leaves straight- veined. Alnus (p. 312). B^tula (p. 311). Cas- 

 tanea (p. 314). Cdrylus (p. 313). 



A. Other shrubs with catliin flowers ; wood soft. S^lix (p. 314). 



* Flowers yellow, yellowish or orange, but not in catliins. (B.) 



B. Leaves straight-veined and oblique at base. "Olmus (p. 308). 

 Coryldpsis (p. 204). Hamamfelis (p. 202). 



B. Leaves straight-veined but not oblique at base, edge doubly and 



sharply serrate ; twigs bright green with large pith. Kfirria 



(p. 162). 

 B. Leaves clustered at ends of twigs ; flowers large, 1 inch, funnel 



form. AzMea (p. 2.J7). 

 B. Leaves with silvery scales ; plants often thorny ; fruit fleshy, 



1-seeded. Elseignus (p. 300). 



B. Leaves clustered along the branches ; plants usually thorny. 

 BiJrberis (p. 64). 



* Flowers pink to rosy or red. (C. ) 



C. Leaves evergreen. (Thickness and smoothness indicate ever- 

 green.) Ardfsia (p. 268). Arbutus (p. 240). Camfellia (p. 79). 



C. Leaves deciduous and plants usually thorny. I'yrus (p. 182). 



CratEegus (p. 1T:1). Primus (p. 142). 

 C. Leaves deciduous and plants without thorns. (D.) 

 D. Flowers larnc, 2-5 inches, hollyhock-like. Hibiscus (p. 81). 

 D. Flower.s much smaller of 5 separate petals (or double). Primus 



(p. 142). Pyrus (p. 182). Spiraea (p. 146). 

 D. Flowers with parts grown together into a tubular, urn-shaped, 

 or globular part. (E.) 

 E. Fruit a capsule with many seeds. Andrdineda (p. 249) . 

 E. Fruit fleshy with 10 or more seeds. Gaylussicia and Vaccfn- 

 ium (p. 244). 



* Flowers white or nearly so. (F.) 



F. Leaves evergreen. (Thickness and smoothness indicate ever- 

 green character.) (G.) 

 G. Thorny plants ; flowers J inch or more in size with 5 petals. 



Pyraciintha (p. 17-5). ilex (p. 86). 

 G. No thorns. (H.) 



H. Flowers large, 2-4 inches, often double in Camellia. Camellia 



(p. 70). Gordbnia (p. 80). 

 H. Flowers small, wheel-shaped ; fruit white or red berries. 



Ardfsia (p. 268). Ilex (p. 86). 

 H. Flowers small, globular or ovate, 5-lobed ; fruit di-y. An- 

 dromeda (p. 240). 

 H. Other evergreens hardy only South. Photinia (p. 179). 

 Escallonia (p. 188). Arbutus (p. 249). 



