CLASSIFICATION OF ANGIOSPERMS. 



565 



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

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

 with a coarse network of whitish lines. Another bark, occurring 

 in quilled pieces, from 8-15 cm. long, and 1-5 cm. wide, has also 

 been found in commerce. 



Hagenia abyssinica is an ornamental tree with 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 (Fig. 



PIG. 316. Soap-bark fr/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 official 

 under the name of Cusso. 



Various 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 Pyrus glabra 

 of Persia. Tannin and gallic acid are found in TORMENTILLA 

 rhizome which is obtained from Potentilla silvestris, a perennial 

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

 hawthorn (Cratagus Oxyacantha} contains quercitrin. A bitter 

 principle and tannin are found in Purshia tridentata of the Rocky 

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

 species. of Pyrus and Prunus. 



