KEYS TO THE GENERA 35 



* Winter keys for deciduous leaved plants which show either flowers 



or fruit when the stems are bare of foliage. (B.) 



B. Plants with winter or early spring flowers Key 10. 



B. Plants with fall or winter fruits Key 11. 



* Special key for thorny and prickly plants, including cactus growths, 



plants which seem to have no foliage, and those with spiny-edged 

 leaves Key 12. 



* Plants with a close cluster of leaves at the tips of the branches. (P.) 

 F. Plants with evergreen leaves. (G ) 



G. Leaves simple, 1-bladed. Rhododendron (p. 260). Kalmia 



Cp. 256). Pittdsporum (p. 68). Ski'mmia (p. 84). 

 G. Leaves very compound. Nandina (p. 67). 

 F. Plants with deciduous leaves. Azalea (p. 257). Zanthorhiza 

 (p. 58). 



* Plants with alternate clusters of leaves along the stem ; without 



thorns (if thorny plants, see 2d* above). Plumbago (p. 268). 

 B^rberis (p. 64). 



* Plants with leaves only at the base and practically no bushy stem. 



Chim^phila and Pyrola (p. 265). 



KEYS TO THE GENERA 



Key 1. Leaves opposite (or whorled), simple, entire-edged and with- 

 out lobes. 



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

 Key based mainly on flowers. The numbers refer to the pages. 



* Flowers conspicuous either by size or clustering and regular, not 



lopsided (irregular). (A.) 

 A. Flower clusters more or less globular, stamens so numerous and 



long as to hide other parts. Acacia (p. 132). 

 A. Flower petals united into a more or less tubular portion. (Under 

 next A see Chionanthus.) (B.) 

 B. Tube slender with a 4-lobed usually spreading border. (C.) 

 C. Stamens2atmouthof tube. (Lilac) Syrlhga (p. 275). (Privet) 



Ligiistrum (p. 279). Olea (p. 282). OsmAuthus (p. 282). 

 C. Stamens 4 within the tube. CephaUnthus (p. 241) . Bvlddleia 



(p. 287). 

 C. Stamens 8 ; flowers with no outer calyx-like portion. Ddphne 

 (p. 298). 

 B. Tube slender with 5-lobed spreading border (sometimes 

 double). (D.) 



