182 Fernald — Melationshvps of some American 



In Asia as in northwestern America the abundance of resin 

 on the branchlets seems to vary without any accompanying 

 change in leaf-outhne or other character j)erceptible in the 

 specimens ; and by comparison with well authenticated Asian 

 specimens of Betiila verrucosa, Ehrh. [B. pendula, Roth), B. 

 mandslmrica, Kegel, and B. latifolia (B. japonica) with its 

 vars. Tauschii and hamtschatica, essentially all the available 

 material of the American B. kenaica (including B. alashana) 

 can be exactly matched. Thus such specimens as Coville and 

 Kearney's :N'os. 1,408, 1,422, and 2,425 of B. kenaica (Nos. 

 373,608, 373,609, 373,622, U. S. ISTat. Herb.) and an old sheet 

 in the National Herbarium from Fort Simpson (Mackenzie 

 District) are good matches for Japanese material collected by 

 Maximowicz and distributed as B. alba, subsp. latifolia a 

 Tauschii, Kegel (represented in the Gray Herb, and by sheet 

 No. 25,341 in the U. S. Nat. Herb.). These specimens also 

 match too closely the original description and figure of var. 

 Tauschii, Kegel.* Further material of var. Tauschii col- 

 lected by Maximowicz in Mandschuria and distributed from 

 the Imperial Herbarium at St. Petersburg (represented in 

 Gray Herb, and by sheet No. 25,345, IT. S. Nat. Herb.) has 

 the leaves more coarsely and irregularly toothed than the speci- 

 mens previously cited, but in this it is not distinguishable from 

 Coville and Kearney's No. 2,412 of B. kenaica (sheets Nos. 

 373,618, 373,619, IT. S. Nat. Herb.) nor from the Bourgean 

 specimen, type of B. alaskana ; nor does this foliage differ 

 from that of specimens collected by Korjhinsky at Blagovye- 

 schensk, Amur (represented in Gray Herb, and by sheet No. 

 273,721 in U. S. Nat. Herb.). Furthermore, these specimens 

 cannot be separated by any apparent character from Kamt- 

 schatkan material sent to the Gray Herbarium by Kegel as his 

 B, latifolia, var. kamtschatica. and they are quite like his 

 original figure of that variety ;f while Macoun's Saskatchewan 

 specimen (No. 12,9'52(X) and McConnell's Dawson specimen 

 (No. 20,327} of B. alaskana, and Coville and Kearney's Nos. 

 1,442, 1,444, 1,445, and 1,626 of B. kenaica (sheets Nos. 

 373,610, 373,611, 373,612, 373,616, U. S. Nat. Herb.) are quite 

 as inseparable from Kegel's original description and figure of 

 B. alba, subsp. mandshurica.X It is thus very evident that 

 Betida kenaica and B. alaskana cannot be treated as local 

 American trees, but that they are quite identical with the well- 

 known B. pendtda or with the Asian tree which was described 

 by Siebold in 1830 as B. japonica, and figured in its various 

 forms by Kegel in 1865. 



*Btill. Soc. Imp. Nat. Mosc, 1865, 399, t. 7, figs. 11-14 (repr. Bemer- 

 kungen liber die Gattungen Betiila und Alnus (1866) 12, t. 7, figs. 11-14). 

 t Bull. Soc. Imp. Nat. Mosc, 1. c, figs. 16-20. 

 X Bull. Soc. Imp. Nat. Mosc, i. c, fig. 15. 



