2. Betula alba, L, var. communis Regel, (Fig 30 一 89.) 
Jap. Makamba, Nagahano-shirakamba. 
Ainu. Datchini, Pettat. 
This variety is not mentiond in Franchet and Savatier's Huumeratio and also ip the Catalogue of the Her- 
barium of the Science College of the Imperial University. On 17th October 1893 I collected the fruit of this 
ZSf} species for the first time, and from this ru I determined the species, This species is widely distributed in 
att our country from Yamato in the south t: Hokkaido in the north. It is curious that the plant having so 
wide a range of distribution in Japan has not been hitherto mentioned by the authors of its flora. The bark 
deg) of this variety is of a slightly red color compared with that of B. alba, var. vulgaris. 
3. Betula, alba, L. var. vulgaris, Regel, (Fig. 33—35.) 
The specime n. (a) figured was collected by 8. Ikeno in Niiyasu, Shinano. 
HR 
トニ Jap. Shirakamba; Shirozakura. 
ーー 
as 4, Betula alba, L. var. Tauschii, Regel., 
Jap. Oba-no-shirakamba. 
Very common, 
5. Betula Bhojpattra, Wall. var. typica, Regel. (Fig, 25—29.) 
Jap. Onoore; Minebari ; Onnore; Onnoren. 

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BRN HI 
_ Japanese Species of Betula. — 



