CLASSIFICATION OF ANGIOSPERMS. 



667 



which are official. In the closely related plant S. hispidus the 

 flowers are numerous and occur in terminal cymes. 





FIG. 365. Butterfly-weed or Pleurisy-root (Asclepias tuberosa), showing the sessile, oblong- 

 ovate leaves and the simple, many-flowered umbels. 



QUEBRACHO or ASPIDOSPERMA is the bark of Aspidosperma 

 Quebracho-bianco, a tree growing in Argentine. It contains a 

 number of alkaloids and is used to some extent in medicine. 



