444 Rydberg : Rocky Mountain flora 



the Vienna Rules. Nuttall, however, did not intend to propose 

 a new genus Actinella, but thought that the Galardia acaidis of 

 Pursh belonged to Actinella Pers., based on Actinea Juss. In 

 reality there is no such thing as Actinella Nutt. Actinella Pers. 

 is a synonym of Cephalophora, to which even DeCandolle thought 

 Galardia acauUs belonged. 



The way Professor Nelson has handled other persons' species 

 of this genus and his own is very arbitrary. Actinella simplex 

 A. Nels., A. incana A. Nels., and A. eradicata A. Nels. he keeps 

 distinct from A. acaulis (Pursh) Nutt. Both Actinella depressa A. 

 Gray and Tetraneuris brevifolia Greene he makes synonyms of his 

 own Actinella acaulis caespitosa, and Tetraneuris glabra Greene 

 and T. glahriuscnla Rydb. of his own Actinella epunctata. He 

 unites T. linearis Greene (Nutt.) and T. angusfifolia Rydb.; 

 T. fastigiata Greene and T. stenophylla Rydb. ; and lumps under 

 Actinella leptoclada A. Gray not only Tetraneuris mancosensis 

 A. Nels. and T. intermedia Greene but also T. Crandallii Rydb., 

 T. arizonica Greene, and T. pilosa Greene (?). 



My studies of the genus have given me quite different results. 

 Galardia acaulis Pursh was collected by Bradbury in "Upper 

 Louisiana." Any one who knows a little about Bradbury's travels 

 knows that this meant along the Missouri River, somewhere be- 

 tween St. Louis, Mo., and Fort Mandan, N. D. Further, the type 

 locality must have been in South Dakota or North Dakota, as 

 no species of Tetraneuris is known to grow near the Missouri 

 south thereof. The common plant of the plains and hills of the 

 western part of the Dakotas and Nebraska has densely silky, 

 linear-oblanceolate leaves. It is well represented by my own 

 nos. io6 and ig6, by MacDougal ^j from Nebraska, and by Bolley 

 404 from Mendora, N. D. It is true that the type of Tetraneuris 

 incana A. Nels. {Elias Nelson 5006) is slightly more delicate and 

 whiter than these, but A. Nelson 8265, determined by the author 

 himself as T. incana matches perfectly my no. 106. Actinella or 

 Tetraneuris incana A. Nels. is therefore in my opinion the true 

 T. acaulis (Pursh) Greene. It is the only one that has been col- 

 lected in the neighborhood of the type locality. The only other 

 species that has been collected in the Dakotas or Nebraska is 

 T. simplex A. Nels. and that only in the very extreme western 



