CHECK LIST OF FOEEST TREES 63 



Populus balsamifera candicans (Aiton) Gray. 



Balm-of-Gilead Poplar. 



Range. — The natural range of this tree has not been satisfactorily determined. 

 It is believed not to be indigenous in the northeastern States and eastern Canada, 

 but as found growing there spontaneously it is thought to have been established 

 from cultivated trees., the origin of which is in doubt. It is said to extend from 

 Newfoundland to Virginia and west to Michigan, South Dakota and Alberta, and 

 Alaska. 



Note on nomenclature. — Originally described as Populus candicans Alton, 

 a name under which it is still maintained by some authors. 



NAMES IN USE 



Balm-of-Gilead (Me., N. H., Vt., Mass., Hairy Balm-of-Gilead. 



N. Dak., Minn., Ont.). Balm-of-Gilead Poplar (lit.). 



Balsam (Mich., Md., and Va. cult.). Ontario Poplar (lit.). 



X Populus jackii Sargent. Jacks Cottonwood (Hybrid). 



Range— Quebec (Nun's Island, at the mouth of Chateaugay River, and at 

 Beauharnois on the south border of the St. Lawrence River) ; Michigan (vicinity 

 of South Haven). 54 



Note on nomenclature. — Believed to be a hybrid between Populus bal- 

 samifera Linnaeus and Populus deltoides Marshall. 



name in use 



Jacks Cottonwood 



Populus trichocarpa Hooker. Black Cottonwood. 



Range. — California (west slope of Sierra Nevada and coast ranges to San 

 Diego County); coast islands; Lower California (San Pedro Martir Mountains). 



names in use 



Black Cottonwood. Balm Cottonwood (Calif.). 



Cottonwood (Calif., trade). 



*Populus trichocarpa hastata Henry. Northern Black Cottonwood. 



Range. — Southern Alaska to northern California; eastward in Washington and 

 Oregon to Idaho and western Nevada (mountains) ; also in Tulare County, Cali- 

 fornia (East Fork Kaweah River — Sargent). 



NAMES IN USE 



Cottonwood (Oreg.). Northern Black Cottonwood. 



Balsam Cottonwood. Black Balsam Poplar (hort.). 



Balm (Oreg.). 



Populus acuminata Rydberg. Lanceleaf Cottonwood. 



Range. — Eastern foothills of the Rocky Mountains and from Assiniboia to 

 northwestern Nebraska, eastern Wyoming, South Dakota (Black Hills), and 

 southern Colorado to southeastern Utah, and in southwestern New Mexico. 

 Said to occur in Nevada. 35 



NAMES IN USE 



Rydberg's Cottonwood (lit.). Smoothbark Cottonwood (lit. and 



Cottonwood. hort.). 



Lanceleaf Cottonwood. 



u Cultivated also in the Arnold Arboretum, Jamaica Plain, Mass. 

 » Fide Britton and Shafer, North Am. Trees, 170, 1908. 



56751°— 27 5 



