MICHIGAN WEEDS. 



377 



SUMACH FAMILY. CASHEW FAMILY. ANACARDIACEAE. 



Trees or shrubs pervaded by resinous or milky, acrid juice; fruit mostly in the form of a drupe. 



Some of the sumachs are occasionally annoying owing to the fact that the plants spread rapidly by 

 long sprouting roots, but the chief reason for notice here is the fact that some of them are very 

 poisonous to the touch to some persons; about 400 species mostly confined to warm regions. 



Fig. 142 (127). 



Foison Ivy. Rhus Toxicodendron L. A 

 bushy vine climbing by rootlets over walls and 

 up the trunks of trees; leaves compound, con- 

 sisting of three leaflets, well shown in the 

 illustration. Very poisonous to the touch to 

 many persons. A rather attractive plant. 

 Native to this country. 



Fig. 143. 



Poison Elder. Poison Sumach. Rhus 

 Vernix L. A shrub or small tree, 2-5 m. 

 high; leaflets 7-15, obovate-oblong, entire. 

 Thriving in swamps where the leaves assume 

 very attractive tints in autumn. To many 

 persons very poisonous to the touch. Native 

 to this country. 



