DR. HOOKER ON THE DISTRIBUTION OF ARCTIC PLANTS. 327 
European, Caucasian, and Siberian. S. media, L., which is reduced by Torrey and Gray to 
a var. of Canadensis, L., is N.W. American. S. Canadensis, L., is not found anywhere 
in Canada, though a native of both N.E. and N.W. America ; it differs from officinalis in 
the long stamens and narrower spikes. S. tenuifolia, Eisch., is N.E. Asian, and con- 
sidered by Asa Gray (Bot. of Japan, p. 387) as hardly more than a variety of Canadensis. 
So much for the local distribution of the common forms ; the only other is S. polygama, 
Nylander, a species retained by Eries, with East Lapland as its only Scandinavian 
habitat. 
Rosa majalis, Herm. This is B. cinnamomea |3, Torrey & Gray, which Ledebour and 
Koch do not even rank as a variety. 
B. blanda, Ait. This is also B. Woodsii, Borr., of « Elor. Bor.-Am.' according to Torrey 
and Gray. Eries does not include it in his Lapland column. B. acicularis, Ldndl. (non 
DC), is referred by Ledebour to alpina, L., and appears to be the same with B. Gmel'nti, 
a common Siberian plant. I do not see how it is to be distinguished from blanda. B. 
Carelica, E. : Ruprecht (Elor. Sam. p. 33) reduces this to a var. of B. acicularis, as do 
Meyen (see Nylander, Dist. Plant. Eenn. p. 86) and Trautvetter (Elor. Boganid.). B. 
fraxinifola, Lindl. (and Seringe), is referred to blanda in ' Flora Boreali-Amcricana ' and 
by Torrey and Gray. 
B. villosa, L., tomentosa, Sm. Bentham adds to this B. mollis, E. Bot. 
B. canina, L., is, according to Ledebour, found in Arctic Lapland; but I find no 
Scandinavian authority for it, and have not included it. 
Pvrus Aucuparia, L. This, and the two plants brought under it, are species, subspecies, 
or local forms, according to the value assigned to those terms. It is remarkable that 
the Greenland one is nearer the American form than the European. P. Americana was 
Aucuparia /3 of Michaux. The true P. Aucuparia is, however, a native of both continents, 
having been found at Lake Winnipeg by Bourgeau, and in Siberia, lat. 64° (Trautv. Elora 
Jenissei). 
Puntjs Padus, L. I almost think that I should consistently have added P. serotina, DC, 
of North of America, to this. 
Amelanchier alnifolia, Nutt. Torrey and Gray reduce all the American Amelanchiers 
to Canadensis, of which this is their var. $ ; it is found on both sides of the Rocky 
^Mountains. 
Epilobium alsinifolwm, Vill. Watson regards this as possibly a^ luxuriant form of 
alpinum, adding that intermediate forms may be assigned to either 
that mountain forms of E. tetragomim occasionally pass for it. Bentham keeps it distinct 
Koch, Torrey and Grav, and Asa Gray make it the same with origanifohum. 
E. Homemanni, Reich. This is alpinum j3 of 'Elora Bor.-Am.,' and y of Torrey and Gray 
Ledebour keeps it distinct. T 
E. origanifolium, Lam. This is E. alpinum y of Torrey and Gray and Asa Gray ; -Le 
debour keeps it distinct, as does Eries, who gives Lapland as habitat for both 
he also 
Ander 
distinguishes these and 'line are by the seeds, which, not being perfected in the majority of 
