52 KEYS TO THE GENERA 



* Leaves alternate with entire edges (sometimes very crowded but 



never truly opposite or whorled). (A.) 

 A. Leaves thick and fully or nearly evergreen. (B.) 



B. Leaves with rolled edges. L6dum (p. 263). Leiophyllum 



(p. 263). 

 B. Leaves without rolled edges. (C.) 



C. Leaves needle-shaped and 4-angled. Plcea (p. 326). 

 C. Leaves linear, sharp-pointed, green below. Tdxus (p. 341). 

 C. Leaves linear, blunt, with white lines below. Tsiiga (p. 326). 

 C. Leaves broad at base, ovate, pointed; twigs green. (South.) 



Riiscus (p. 323). 

 C. Leaves very hairy ; flowers cup-shaped with 10 stamens in 



dents. Kalmia (p. 256). 

 C. Other evergreens with small alternate entire-edged leaves. 



D. Flowers tubular with 4 spreading lobes. Daphne (p. 298). 

 D. Flowers bell-shaped, 4-lobed in drooping clusters. Erica 



(p. 254). 

 D. Flowers small, peculiar, in erect clusters. Ceanothus 

 (p. 97). 

 A. Leaves thinner and not evergreen. (E.) 

 E. Flowers yellow, pea-shaped ; twigs green. Genista (p. 114). 

 E. Flowers regular of 5 separate petals. Spirsea (p. 146). 

 E. Flowers generally pink in very small clusters ; leaves minute, 

 clasping the stem at base on thread-like twigs. TAmarix (p. 73). 



* Leaves alternate with notched edges. (F.) 



F. Leaves whitish or silvery-gi-ay, much divided into lobes ; plant 

 aromatic. Santolina (p. 243). 



F. Other shrubs with notched, small leaves. Spir^a (p. 146). ilex 

 cren3,ta (p. 88). 



* Leaves opposite, thick, and evergreen (including scale-like leaves 



covering the stem) . (G.) 



G. Leaves linear and sharp-pointed. Junfperus (p. 337). 



G. Leaves oval and about flat. Biixus (p. 306). Cean6thus (p. 07). 

 G. Leaves oval with rolled edges. Leiophyllum (p. 263). 

 G. Leaves very small, ^ inch or less, and pressed to the stem which 

 they practically cover. (H.) 

 H. Flowers yellow, May-July. Huds6nia (p. 72). 

 H. Flowers pink or white, July-September. Erica (p. 254). Cal- 



luna (p. 255). 

 H. Flowers inconspicuous ; fruit a cone. Thtija (p. 828). 



* Leaves opposite and not fully evergreen. Lonioera (p. 230), 



* Leaves whorled on the stem. (I.) 



