200 Trees with Compound Leaves. [D n 



Found, from Northern New England westward and south- 

 ward, oftenest in swamps. 



A small tree (or more often a tall shrub), six to 

 eighteen feet high. It is violently poisonous to the 

 touch, causing in most persons a painful eruption ; some 

 are poisoned by it without touching it ; probably by rea- 

 son of the drifting pollen of its flowers. A recommended 

 application is sugar of lead, applied after the use of saline 

 cathartics ; or a thick paste of bicarbonate of soda rubbed 

 into the skin as soon as the eruption appears. It is also 

 claimed that relief and, if used promptly, frequent cure 

 follow the use of belladonna, of apis mellifica, or of 

 arsenicum album taken in homoeopathic doses. 



Apart from other differences the Poison Sumach can 

 be easily and quickly distinguished from all the other 

 sumachs by these signs : It differs from the Stag-horn 

 Sumach and the Smooth Sumach (a shrub) in having the 

 edge of its leaflets entire ; from the Dwarf Sumach (a 

 shrub) in the absence of the winged stem between its 

 leaflets, and by its red leaf-stem. 



Genus PYRUS, L. (Mountain Ash.) 



(NOTE. See others of the same genus, Sec. A, //., p. 32.) 



Fig. ioi. Mountain Ash. P. Americana, D. C. 



Leaves, COMPOUND (odd-feathered ; leaflets, nine to fifteen); 

 ALTERNATE (often alternate in threes) ; EDGE OF LEAF- 

 LETS FINELY AND SHARPLY TOOTHED. 



Outline of leaflet, long and narrow egg-shape. Apex, 

 taper-pointed. Base, rounded or slightly pointed. 



Leaflet-stem, lacking, or very short. 



