CLASSIFICATION OF ANGIOSPERMS. 



291 



of quince. The manna of Luristan is obtained from P\nis glabra 

 of Persia. Tannin and gallic acid are found in Tormentilla 



Fig. ISO. Fruiting branch of wild black cherry (Prunus serotina). 



rhizome which is obtained from Potentilla silvestris, a perennial 

 herb of Europe, and other species of Potentilla. The fruit of the 



