Rydberg : Rocky Mountain flora 453 



untenable and belongs evidently to A. Siiksdorfii. The Cali- 

 fornia-Nevada plant has been described as A. Kennedyi A. 

 Nels., but even this must pass into synonymy, for the plant has 

 an older name, A. Douglasiana Besser. 



Under Artemisia discolor is given as a synonym: ".4. elatior 

 (T. & G.) Rydb. as to our range." A. discolor and A. elatior 

 can never be confused, but perhaps this could happen with the 

 latter and A. incompta Nutt., which Nelson has regarded as a 

 variety of A. discolor, following Dr. Gray. Good specimens of 

 A. elatior, resembling the type in the Columbia University her- 

 barium, have been collected in Montana and one specimen which 

 I can refer to no other described species we have from Colorado. 



Artemisia spiciformis Osterhout is reduced to a synonym of 

 A. arbuscula Nutt. It is not related to that species but is related 

 to A. Rothrockii A. Gray. The specimens from Utah collected 

 by Ward and Parry and referred to by Dr. Gray,* belong to A. 

 spiciformis Osterhout. 



Nelson has also reduced several species to varieties, viz., 

 A. Parryi A. Gray, A. coloradensis Osterhout, A. diversifolia 

 Rydb., A. silvicola Osterhout, and A. Bakeri Greene. 



There is scarcely any better species than A. Parryi and it 

 can never be justly referred to A. saxicola. Not only has the 

 plant "a tendency to become glabrate," but the pubescence, if 

 any is present, is not that of A. saxicola, but is short-silky and ap- 

 pressed, the heads are usually much more numerous than in that 

 species and not racemose, and the corollas are perfectly glabrous. 

 If it were not for the absolute lack of tomentum I should place 

 it next to A. franserioides and A. discolor. It is strange that 

 Professor Nelson reduced this species to a variety, while he re- 

 garded A. Pattersonii as distinct from A. scopuloriim. Besides, 

 what rules of nomenclature was he following, when he reduced 

 the older species A. Parryi to a variety of the later A. saxicola? 



Artemisia coloradensis Osterhout is made a variety of A. 

 Wrightii. As A. Wrightii of Nelson is not the original A. Wrightii 

 A. Gray, but A. kansana Britton (see above), a new combination 

 is necessitated, if the specific rank of A. coloradensis is not upheld. 



Artemisia diversifolia Rydb. is made a variety of A. gnapha- 



*See Syn. FI. P: 375. 



