49 



Betula lenta Linn. Sweet Birch. 



Range. — Newfoundland to northwestern Ontario and southward to southern, 

 Indiana and Illinois, and along the Allegheny Mountains to central Kentucky, 

 Tennessee, and western Florida. 



Names in use.— Sweet Birch (Me., N. H., Vt., Mass., E. I., N. Y., 

 X. J., Pa., Del., S. < !., Mich., Minn.) ; Birch (N. C.) ; Black Birch (N. H., 

 Vt., Mass., R, I., Conn., X. Y., N. J., Pa., W. Va., Ca., 111., Ind., Mich., 

 Ohio); Cherry Birch (X. H., E. I., N". Y. 7 Pa., Va., Del., N. C, S. C, 

 Fla., Wis., Mich., Out.); River Birch (Minn.); Mahogany Birch (N. C, 

 S. C); Mountain Mahogany (S. C). 



ALNUS Ehrh. 

 Alnus maritima (Marsh.) Muehl. Seaside Alder. 



Range. — Southern part of the peninsula of Delaware and Maryland (Nanticoke 

 River near Seaford, Del.; Wicomico River near Salisbury, Md.) ; Indian Territory 

 (Red River). 



Names in use. — Seaside Alder (De\.)-^ Alder (Del.). 

 Alnus acuminata H. B. K. Lanceleaf Alder. 



Alnus oblonglfolia Torr. 



Range. — Southern New Mexico and Arizona (canyons of mountains) ; southern 

 Mexico, Central America to Peru (Andes,. 



Alnus rhombifolia Nutt. White Alder. 



Range. — From northern Idaho to the eastern slope of the Cascade Mountains of 

 Washington and southeastern Oregon, and southward through California (coast 

 ranges, western slopes Sierra Nevada, San Bernardino, San Jacinto, and Cuayamaca 



mountains). 



Names in use. — Alder (Cal., Oreg.); Western or California Alder 

 (Idaho); Mountain Alder. 



Alnus tenuifolia Nutt. Paperleaf Alder. 



Alnus incana var. virescens Wats. 



Range. — From British Columbia (Kicking Horse Lake to Lower Fraser River) 

 through the Rocky Mountains to northern New Mexico, to southern California 

 (Sierra Nevada), and Lower California. 



Alnus oregona N utt. Red Alder. 



Range. — From Sitka (through islands and coast ranges of British Columbia, 

 western Washington, and Oregon) to California (coast ranges to Santa Inez Moun- 

 tains, near Santa Barbara). 



Names in use.— Alder (Cal., Oreg.) ; Red Alder (Cal., Greg.) ; West- 

 ern or Eed Alder. 



Alnus glutinosa (Linn.) Gaertn. European Alder. 



Range, — Europe and northern Asia, but naturalized in few localities in the United 

 States. 



varieties distinguished in cultivation. 



Alnus glutinosa quercifolia Willd. 

 Alnus glutinosa laciniata ( Ehr. ) Willd. 

 Alnus glutinosa incisa Willd. 

 Alnus glutinosa aurea (Koch) Nichol. 

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