KEYS TO THE GENERA 41 



E. Flowers short with a 5-lobed spreading border, in large clus- 

 ters. Sambiicus (p. 226). 

 D. Kegular with corolla of 5 separate petals ; fruit bladder-like. 

 Staphylfea (p. 105). 



* Flowers inconspicuous by small size or lack of color. Acer (p. 103). 



Key 5. Leaves alternate, simple with entire edges. 

 (For small-leaved plants, leaves under 1 inch long, use Key 9, p. 51). 

 Key based on leaves. For a key based more on ilowers, see the next, 

 5 a. 



* Spiny or thorny plants. (A.) 



A. Leaves with silvery scales on one or both sides. Elaedgnus 



(p. 300). Hippophae (p. 303). 

 A. Leaves without silvery scales. (B.) 



B. Fruit 1 to few-sefided berries. Bfirberis (p. 04). Lycium 



(p. 284). 

 B. Fruit 1-seeded cherry-like drupes. Buinfelia (p. 269). 

 B. Fruit (when found) large, orange-like in form and size ; plant 



milky-juiced. Macltira (Toxylon) (p. :310). 

 B. Fruit elongated pea-like pods. AC('icia(p. 132). Ulex(p. 113). 



* Plants not spiny. (C. ) 



C. Leaves heart-shaped. 1, fully shrubby, C^rcis (p. 125). 2, herba- 

 ceous, Polygonum (p. 299). 

 C, Leaves narrow, one fourth as wide as long. (D.) 

 D. Flowers over an inch long of 5 bright yellow petals. Helidn- 



themum (p. 69). 

 D. Flowers with a long tube and 4-lobed spreading border. 



Diiphne (p. 298). 

 D. Flowers small ; fruit a 1-seeded berry ; leaves silvery below. 



ElfBiignus (p. 300) . 

 D. Flowers small, globular, 5-Iobed, in June. Andr6medapolif61ia 



(p. 253). 

 D. Flowers usually in globular clusters, apparently of yellow 

 stamens only. Acicia (p. 132). 



D. Flowers with long red stamens, sessile in a leafy-tipped cluster. 

 Callistfemon (p. 207). 



C. Leaves larger and wider, decidely aromatic or pleasantly 

 scented. (B.) 



E. Leaves thick and about evergreen. Pfirsea (p. 294). Myrica 

 (p. 311). Sklmmia (p. 84). Callistfemon (p. 207). 



E. Leaves thinner and deciduous. Benzbin (p. 297). Sassafras 

 (p. 296). 

 C. Leaves thick, evergreen or nearly so, not especially aromatic. (F. ) 



