90 



TREES OP THE NORTHERN UNITED STATES 



R. ttfphina. 



1. Rhtis typhina, L. (STAG-HORN SU- 

 MAC.) Leaflets 11 to 31, oblong-lanceo- 

 late, pointed, serrate (rarely laciniate), 

 pale beneath. Branches and footstalks 

 densely hairy. Fruit globular, in large, 

 dense, erect panicles, covered with crim- 

 son hairs. Shrub or tree, 10 to 30 ft. 

 high. It is very common along fences 

 and on hillsides. The wood is orange- 

 colored and brittle. 



2. Rhus glabra, L. (SMOOTH SU- 

 MAC.) Leaflets 11 to 31, lanceolate- 

 oblong, pointed, serrate, smooth, glau- 

 cous white beneath. Branches not 

 hairy. Fruit globular, in a rather open, 

 spreading cluster, covered densely with 

 crimson hairs. A shrubby plant, 2 to 

 12 ft. high, found quite abundantly in 

 rocky or barren soil throughout. 



Var. laciniata is frequently planted 

 for ornament. It has very irregularly 

 twice-pinnate leaves drooping grace- 

 fully from the branches. 



3. B-htis copallina, L. (DWARF MOUN- 

 TAIN SUMAC.) Branches and stalks downy ; 

 leafstalk wing-margined between the 9 to 

 21 oblong-lanceolate, usually entire leaf- 

 lets, which are oblique at base and smooth 

 and shining above. Wild in rocky hills 

 throughout; often cultivated. North, a 

 beautiful shrub ; 

 south, a tree. 2 

 to 25 ft. high. 



4. Rhtis ve- 

 nenata, DC. 



(POISON-SUMAC. 

 B-lacinlita. PoiSON-DOG- 



WOOD. POISON-ELDER.) Leaflets 7 to 13, 

 obovate-oblong, entire, abruptly pointed, 

 smooth or nearly so. Fruit small, globu- 

 lar, smooth, dun-colored, in loose axillary 



R, copalli 



