CLASSIFICATION OF ANGIOSPERMS. 



321 



toxicodendrol, and is closely associated with some resinous sub- 

 stances. Japanese lac is thinned with camphor, or mixed with 

 linseed oil and on drying in a moist atmosphere forms the most 

 indestructible varnish known. Various pigments are used, as Ver- 

 million, gamboge, acetate of iron and other stibstances. The best 

 glossy black colors are obtained by the addition of iron. 



Rhus glabra or the Scarlet Sumac is a shrub (Fig. 164). 

 The leaves are, 11- to 31 -foliate, the leaflets being lanceolate, acu- 



FiG. 164. Rhus glabra. Portio;i of leafy branch with terminal compound 

 panicle of fruits. 



minate, sharply serrate, dark green above and tomentose below; 

 the flowers are greenish, polygamous and in terminal panicles; 

 the fruit is official (p. 569). 



Chinese galls are excrescences produced on Rhus semialata 

 as a result of the stings of an Aphis. Japanese galls are similar 

 formations occurring on Rhus japonica. ' (See Galla.) 



Pistacia Lentiscus is a shrub or tree, which is found growing 

 in the Grecian Archipelago. The leaves are pinnately compound 

 and with winged axis, the leaflets being alternate, oblong, entire. 



