444 RypBerG: Rocky MounrAIN FLORA 
the Vienna Rules. Nuttall, however, did not intend to propose 
a new genus Actinella, but thought that the Galardia acaulis 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 acaulis 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 7. glabriuscula Rydb. of his own Actinella epunctata. He 
unites T. linearis Greene (Nutt.) and T. angustifolia 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. 106 and 196, by MacDougal 53 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 
