KEYS TO THE GENERA 43 



M. 6 to 15 thick petals. Magn51ia (p. 58). 



M. 5 stalked petals. Exocli6rda (p. 101). Lagerstroemia 



(p. 209). 

 M. Pea-shaped flowers. 1, White. Cytisus(p. 113). 2, Yellow. 



Genista (p. 114). 

 M. Funnel-shaped flowers, sometimes double. Azalea (p. 257). 



Leucophyllum (p. 285). 

 M. Salver-shaped flowers, long tube and 5-lobed spreading 



border. Plumbago (p. 268). 

 M. Bell-shaped of 5 nearly separated petals. Styrax (p. 270). 

 L. Flowers much smaller, i inch or less, petals united. (N.) 

 N. Cup-shaped with 10 stamens in dents in corolla. Kalmia 



(p. 256). 

 N. Tubular, bell- or urn-shaped or globular, with 5-lobed 



border. Andr6raeda (p. 249). Gayluss^ciaand Vaccinium 



(p. 244). 

 N. Bell-shaped, yellow, very small, with 4-lobed border, in 



earliest spring. Dirca (p, 207). 

 N. Leaves very largp, 5-12 inches long, somewhat heart- 

 shaped. Polygonum (p. 299). 

 L. Flowers small with separate petals. (O.) 



O. Flowers white or greenish in conspicuous clusters. Spiraea 



(p. 146). Photinia (p. 179). 

 O. Flowers white in long slender racemes. Cyrilla (p. 89). 

 O. Flowers inconspicuous ; fruit red or black berries ripe in 



fall. Nemopanthus (p. 88). Rhamnus (p. 93). 



Key 5a. Leaves alternate, simple with entire edges. 

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

 Key based mainly on flowers. For a key based on leaves, see the 

 preceding. Key 5. 



* Flowers yellow, yellowish or orange. (A.) 

 A. Flowers large, 1 inch or more, funnel-shaped, somewhat irreg- 

 ular, lopsided. Azalea (p. 257). 

 A, Flowers large of 5 spreading petals open only in the sunshine. 



Helianthemum (p. 69). 

 A. Flowers large, irregular, pea-shaped. Genista (p. 114). 

 A. Thorny plants with small flowers in spring. Hippophae (p. 303). 



B^rberis (p. 64). Elseagnus (p. 300). 

 A. Tough-barked plant, rarely cultivated, with very small flowers. 



Dirca (p. 297). 

 A. Aromatic or spicy plants with small flowers in early spring. 

 Sassafras (p. 296). Benzoin (p. 297). Persea (p. 294). 



