CLASSIFICATION OF ANGIOSPERMS. 295 



Pterocarpus santalinus is a small tree with trifoliate leaves, 

 and flowers and fruits resembling those of P. Marsiipiuiu. The 

 heart-wood is official (p. 547). 



Hamatoxylon caiiipechianum is a small tree with irregular 

 spinous branches. The leaves are 8- to lo-foliate, the leaflets 

 being sessile and obcordate. The flowers are fragrant, have a 



Fig. 152. Tragacanth plant (Astragalus gummifer): A, flowering branch; B, 

 -modified, thorn-like leaf with stipules at the base; C, irregular (bilateral) flower; D, legume 

 -oi A. aristaius. — ^After Taubert. 



purple calyx and yellow corolla, and are in racemes. The fruit 

 is a slender, lanceolate, flat pod, which dehisces laterally instead 

 of along the sutures. The heart-wood of this tree constitutes the 

 official Logwood which is recognized in nearly all the pharma- 

 copoeias (p. 546). 



Krameria triandra is a shrub with simple, ovate-lanceolate, 

 sessile, silver- white, glistening leaves (Fig. 154). The flowers are 



