British North American Plants. 423 



Veratrum album, in Europe, and v. 



Eschscholtzia, Gray, in'Canada V. album v. grandiflorum, Max. 



Chrysoplenium alternifolium, L. C. alternifolium v. Japonicum, Max. 



American. 



Species in America. Represented in Japan by 



Viola pubescens, Ait V. pubescens v. brevistipulata, Fran. 



Potentilla Pennsylvania, L P- Pennsylvania v. hypoleuca, Eeg. 



Thuja gigantea, Nutt T. gigantea v. Japonica, Max. Under 



cultivation only. 



Scirpus eriophorum, Max S. eriophoruni v. Nipponica, Fr. 



Acer spicatum, Lam • • • A. spicatum v. Ukurunduense, Midd. 



These examples would appear to establish that taking the 

 plants in Europe in the one case and those in Canada in 

 the other, as the types of the species, the variation has 

 taken place with the progress of the plant westward. 



Variation has taken place even in the migration of species 

 to British Columbia. Thus, Aetata spicata, L., of Europe, 

 has become Aetata spicata v. rubra, Ait, in Ontario and Que- 

 bec, and A. spicata v. arguta, Torr, in British Columbia and 

 Alaska, Potentilla anserina, L., in Europe and Eastern 

 Canada has become P. anserina v. grandis, Lehm., in British 

 Columbia, and Sambucus pubens, Mx., of our eastern pro- 

 vinces has become S. pubens v. arborescens, T. G-., in British 

 Columbia and Alaska. 



That there has also been an eastward migration of plants 

 from Asia into America is illustrated by the following 

 plants among others, which occur in both Japan and 

 Alaska, but do not range beyond Alaska eastward or south- 

 ward into Canada. 



Anemone narcissiflora, L. 

 Potentilla fragiformis, Willd. 

 Saxifraga Dahurica, Pallas. 

 Epilobium afBne, Bong. 

 Cnicus Kamtschaticus, Maxion. 

 Cassiope stelleriana, D. C. 

 Phyllodice Pallasiana, Don. 

 Primula cuneifolia, Ledeb. 

 Gentiana frigida, Hoenke. 



{To be continued.) 



