659 



B. papyrifera cont. 



B. Ermani, Rothrock (not Cham.}. 

 B. excelsa, Ait. 



B. glandulosa, Hort. (not Michx.}. 

 B. grandis, Schrad. 

 B. latifolia, Hort. 

 B. occidentalis, Lyall (not Hook.). 

 B. papyracea, Dryand. ; Wats. Dendr. Brit. t. 152. 

 B. platyphylla, Hort. 

 B. pyrifolia, Z?br. 

 Var occidentalis, Dippel. 



B. americana, 

 B. papyrifera x pumila. Garden origin. 



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

 t, 450 : Wats. Dendr. Brit. ii. t. 151. North 

 America. " Gray Birch." 



B. acuminata, Ehrh. 



B. alba var. populifolia, Spach. 



B. laciniata, Hort. (not Wahlenb.). 



B. populifolia, Ait. 



B. populifolia pendula, Hort. 



B. pumila, L. Wats. Dendr. Brit. 

 " Low Birch." 



t. 97. North America. 



B. dahurica, Hort. (not Pall.). 

 B. fruticans, Hort. (not Pall.). 

 B. nana rotundifolia, Hort. 

 B. rotundifolia, Hort. 

 Var. fastigiata, Hort. 



. ulmifolia, S-ieb. & Zucc. ; Bot. Mag. Jap. viii. 1894, 

 t. 6, ff. 16-19. Japan, &c. 



B. alba car. costata, Hort. 

 B. costata, Trautv. 



