CLASSIFICATION OF ANGIOSPERMS. 



565 



A spurious quillaja bark (Q. Pocppigii) differs from tlie 

 official in being thinner, darker and in having the surface covered 

 with a coarse network of whitish Hues. Another bark, (jccurring 

 in quilled pieces, from 8-15 cm. long, and 1-5 cm. wick-, lias also 

 been found in commerce. 



Hagenia abyssinica is an ornamental tree witli 7- to 13-foliate 

 leaves. The flowers are monoecious and occur in panicles ; the 

 staminate being greenish-yellow and with 20 stamens ; and the 

 pistillate fragrant, bicarpellary, and with a reddish calyx ( I^^ig. 



Pig. 316. Soap-bark t^ee (Quillaja Saponaria): A, flowering branch; B, one of the 

 hermaphrodite flowers; C, the latter in longitudinal section. — After Baillon. 



317). The fruit is a nutlet. The pistillate flowers are oftlcial 

 under the name of Cusso. 



A arious species of Prunus yield gums, as cherry, peach, 

 apricot, etc. Mucilage is found in the testa of certain seeds, as 

 of quince. The manna of Luristan is obtained from Pynis (jlabra 

 of Persia. Tannin and gallic acid are found in Tohmkxtiula 

 rhizome which is' obtained from Potcntilla silvcstvis, a perennial 

 herb of Europe, and other species of Potentilla. Tlic fruit of ilic 

 hawthorn {Cratccgus OxyacantJia) contains quercitrin. A bitter 

 principle and tannin are found in Piirsliia trident at a of the Rocky 

 Mountains. Phloridzin is found in the root bark of a number of 

 species of Pyriis and Prunus. 



