657 



B. lenta, L. ; Wats. Dendr. Brit. t. 144 ; Sargent Silva of 

 North America t. 448. North America. " Cherry 

 Birch." 



B. carpinifolia, Ehrli. 



B. nigra, Du Roi (not L.). 



B. lutea, Miclix. ; Sargent Silva of North America t. 449. 

 North America. " Yellow Birch." 



B. excelsa, Pursh. (not Ait.). 

 B. lenta var. lutea, Regel. 

 B. persicifolia, Hort. 



B. Maximowiczii, Regel ; Bot. Mag. Jap. viii. 1894, t. 6, 

 ff. 3(5-8. Japan. 



B. Medwediewi, Regel Gartenflora 1887, 384, f. Caucasus. 



B. nana, L. : Engl. Bot. ed. 3, t. 1297. Northern Hemis- 

 phere. 



B. nigra, L. ; Wats. Dendr. Brit. t. 153 ; Sargent Silva 

 of North America t. 452. United States. 4 ' Red 

 Birch." 



B. angulata, Lodd. 

 B. caiiescens, Hort. 

 B. flavescens, Hort. 

 B. lanulosa, Michx. 

 B. r ubra, Miclix. 



B. occidentalis, Hook. ; Sargent Silva of North America 

 t. 453. Western North America. " Black Birch." 



B. alba subsp. occidentalis, Regel. 



B. papyrifera, Marsh. ; Sargent Silva of North America 

 t. 451. North America. " Paper Birch ; Canoe 

 Birch." 



B. alba var. papyrifera, Spach. 

 B. amygdalifolia, Hort. 

 B. cordifolia, Regel. 



