CLASSIFICATION OF ANGIOSPERMS. 



305 



in axillan- cymes ; the fruit is a black. 2-valved capsule. X. Clazv- 

 Hcfcnlis or the southern prickly ash is a very prickly shrub, which 

 is characterized by having cork-wings on the bark. The leaves 

 are 5- to 17-foliate, the leaflets being ovate and crenulate ; the 

 flowers arc in terminal racemes and have a calyx of 4 or 5 sepals, 



Fig. 157. Cocaine: A, monoclinic crystals of cocaine; B.orthorhombic cr\-stals of co- 

 caine hydrochloride; C, monoclinic crystals of cocaine hydrochloride and palladous chloride; 

 D, skeleton aggregates cf cocaine hydrochloride and palladous chloride. 



the calyx being wanting in A^. americanum. The bark of these 

 two species is official (p. 532). 



Pilocarpus. To this genus belong a number of species which 

 are shrubs or small trees and indigenous to tropical America. 

 The Ifeaves are mostly pinnately-compound. the leaflets being 

 coriaceous and entire; the flowers are small, greenish and in 



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