48 KEYS TO THE GENERA 



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

 tanea (p. 314). Corylus (p. 313). 



A. Other shrubs with catkin fli)\vers \ wood soft. S^hx (p. 314). 



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



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

 Coryl6psis (p. 204). Hamam^lis (p. 202). 



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



sharply serrate ; twigs bright green with large pith. Kerria 



(p. 1G2). 

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



form. Azalea (p. 257). 

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



1-seeded. El?eagnus (p. 300). 



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

 B(irberis (p. 64). 



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



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

 green.) Ardisia (p. 2G8). Arbutus (p. 249). Camellia (p. TO). 



C. Leaves deciduous and plants usually thorny. Tj'rus (p. 182). 



CratEegus (p. 173). Primus (p. 142). 

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



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

 D. Flowers much smaller of 5 separate petals (or double) . Prunus 



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

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

 or globular part. (E.) 

 E. F'ruit a capsule with many seeds. Andr6meda (p. 249). 

 E. Fruit fleshy with 10 or more seeds. Gayluss^cia and Vaccin- 

 ium (p. 244). 



* Flowers white or nearly so. (F.) 



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

 green character.) (G.) 

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



Pyracantha (p. 175). Ilex (p. 86). 

 G. No thorns. (H.) 



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



(p. 79). Gord6nia (p. 80)*. 

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



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

 H. Flowers small, globular or ovate, 5-lobpd ; fruit dry. An- 

 dromeda (p. 249). 

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

 E.scallonia (p. 188). Arbutus (p. 249). 



