RYDBERG: Rocky MOounNTAIN FLORA 319 
is distinct and easily distinguished by its broad spreading rays. 
The name it should bear is E. simplex Greene. EE. leucotrichus 
Rydb. is a more luxuriant form of the same. It is questionable 
if EL. melanocephalus Nelson should not be included in it also, 
differing only in the blackish hairiness of the involucre. 
Professor Piper in his flora of Washington has transferred the 
types of both Diplopappus filifolius Hook. and Erigeron filifolius 
Nutt. in the Columbia University herbarium, and they both be- 
long to the species described under the latter name in Gray’s 
Synoptical Flora. What probably led Professor Piper astray was 
the following words in Hooker’s description: ‘“‘radtis flavescenti- 
bus.”’ This does not necessarily mean that the plant has yellow 
rays. The original meaning of flavescens is turning (light) yellow. 
White flowers often turn yellowish in drying. As E. filifolius has 
white as well as violet rays, the rays are often yellowish in drying. 
WYOMINGIA 
As instituted in the New Manual this genus is very unsatis- 
factory, for if the more imbricated bracts with thickened backs 
are made the distinguishing character separating Wyomingia from 
Erigeron, then E. Garrettii A. Nels., E. tener A. Gray, E. Tweedyi 
Canby, E. caespitosus Nutt., E. nevadensis A. Gray, E. luteus 
A. Nels., E. filifolius Nutt., etc., should be included in Wyo- 
mingia. If the achenes should count for anything, E. montanensis 
and perhaps E. canus could not very well be included. The former 
has flattened achenes and the latter has glabrous and 8-10-nerved 
achenes, while the rest of the genus has pubescent and 4—5~angled 
achenes. It would be desirable to take out Wyomingia as a genus, 
for the plants fit rather poorly in Erigeron, but the question is 
where to draw the line. The species with flattened achenes with 
the involucre of Wyomingia would constitute a rather natural 
genus, but such species as E. utahensis destroy the distinctness. 
ANTENNARIA 
A footnote under this genus in the New Manual states: ‘The 
treatment of this genus is largely an adaptation of Professor Elias 
