47 



Names in use.— Cottonwood (N. II., Vt., Mass., R. I., N. Y., IS". J., 

 W. Va., N. C, Ala., Fla., Miss., La., Tex., Cal., Ky., Mo., 111., Wis., 

 Kans., Nebr., Iowa, Minn., Mich., Ohio, Ont., Colo., Mont., K Dak., 

 S. Dak.); Big Cottonwood (Miss., Nebr.); Yellow Cottonwood (Ark., 

 Iowa, Nebr.); Cotton-tree (N. Y.); Carolina Poplar (Pa., Miss., La., 

 N. Mex.; Ind., Ohio); Necklace Poplar (Tex., Colo.); Vermont Poplar 

 (Vt.); Whitewood (Iowa); Broad-leaved Cottonwood (Colo.). 



VARIETIES DISTINGUISHED IN CULTIVATION. 



Populus deltoides aurea (Nichol.) Sudw. G-oldenleaf Cottonwood. 



Populus deltoides erecta (Selys) Sudw. Erect Cotton-wood. 



Populus deltoides crispa (Dipp.) Sudw. Crisp-leaf Cottonwood. 



Populus fremontii 1 Wats. Fremont Cottonwood. 



Range. — Western California (Sacramento River) to Lower California; eastward to 

 central Nevada, southern Utah and Colorado, western Texas and northern Mexico. 



Names in use. — Cottonwood (Cal., Utah); White Cottonwood (N, 

 Mex.). 

 Populus alba Linn. White Poplar. 



Range. — Europe. Widely naturalized in the United States by cultivation. 



VARIETIES DISTINGUISHED IN CULTIVATION. 



Populus alba nivea (Willd.) Loud. Snowy Poplar. 



Populus alba canescens (Smith) Loud. Silver Poplar. 



Populus alba canescens umbraculifera Sudw. Weeping Silver Poplar. 



Populus alba bolleana Louche. Bolle Poplar. 



Populus alba nutans Sudw. Weeping White Poplar. 



Populus alba globosa Dipp. Roundtop Poplar. 



Populus nigra Linn. Black Poplar. 



Range. — Europe. Naturalized in several localities in the East. 



VARIETIES DISTINGUISHED IN CULTIVATION. 



Populus nigra italica Du Roi. Lombardy Poplar. 



Populus nigra elegans Bailey. 



Family BETULACE^E. 



BETULA Linn. 

 Betula populifolia Marsh. White Birch. 



Range.— From Nova Scotia, New Brunswick, and Lower St. Lawrence River south- 

 ward (mostly in coast region) to Delaware (Newcastle County) and westward through 

 uorthern New England and New York to Lake Ontario (southern shores). 



Xames in use.— White Birch (Vt., Mass., E. I., Conn., K Y., K J., 

 Penn., Del., Out.); Gray Birch (Me., B. I., Mass.); Oldfield Birch; 

 Poverty Birch (Me.); Poplar leaved Birch; Small White Birch (Vt.). 



Betula populifolia x papyrifera Sargent. 

 Range. — Massachusetts and New Hampshire — local. 



1 Includes P. Fremontii var. Wislizeni Wats. 



