450 RypperG: Rocky MouNTAIN FLORA 
The other Nelsonian species have in my opinion no claim to 
specific rank. Two duplicates of the type of Artemisia gracilenta 
A. Nels., one in the Columbia University herbarium and the other 
in the New York Botanical Garden collection, are almost identical 
with the two original specimens of A. floccosa Rydb. The only dif- 
ference is that the segments of the leaves of the former are somewhat 
narrower. There are also two duplicates of A. pawcicephala 
A. Nels., which differs from A. floccosa only in the fact that the 
upper leaves are entire. As Nelson himself unites A. pawci- 
cephala and A. gracilenta and the original A. floccosa is intermed- 
iate between the two, I see no reason why they should not be re- 
duced to synonyms of A. floccosa, which is three years older. 
Artemisia subglabra A. Nels., of which there are two duplicates 
here, is identical with A. graveolens Rydberg, three years older. 
The leaves of even Nelson’s own specimens show traces of tomen- 
tum on the lower surface. The species is related to A. discolor, 
not to A. saxicola, with which Nelson has placed it. 
Artemisia natronensis A. Nels. is, according to a duplicate of 
the type and several specimens distributed from the University 
of Wyoming, the same as A. longifolia Nutt., as that species is 
understood. The specimens which I referred to A. natronensis 
in my Flora of Colorado do not belong there. They are unusually 
large-headed A. diversifolia or at least closely related to it. I 
wish to make this correction here. 
Now let us take up the species reduced by Professor Nelson. 
Artemisia Scouleriana (Besser) Rydb. and A. Forwoodii S. Wats. 
are reduced to synonyms of A. canadensis. 
Artemisia canadensis Michx. is a subarctic plant and not found 
in the Rocky Mountains within the United States. The type 
came from the shores of the Hudson Bay. It is a low plant with 
the leaves mostly basal, with narrowly linear divisions, and com- 
paratively few heads nearly as large as those of A. spithamaea 
hese (A. borealis Auct. Am.) and ina narrow panicle. I have seen 
specimens from the White Mountains; Vermont; the Gaspé 
Peninsula, Que.; Keweenaw Point, Mich.; and the Yukon Ter- 
ritory; but from nowhere in our western states. The specimens 
named Artemisia canadensis from there belong to A. Forwoodit 
or A. Scouleriana. Whether the latter two should be regarded as 
