Rydberg : Rocky Mountain flora 319 



is distinct and easily distinguished by its broad spreading rays. 

 The name it should bear is E. simplex Greene. E. leiicotrichus 

 Rydb. is a more luxuriant form of the same. It is questionable 

 if E. melanocephaliis 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 

 name Erigeron filifolius (Hook.) Nutt. to what was usually 

 known under the name E. peucephyllus A. Gray. This change 

 was wholly unwarranted, I think. There are duplicates of 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: "radiis flavescenti- 

 bus." This does not necessarily mean that the plant has yellow 

 rays. The original meaning of fiavescens 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. Tiveedyi 

 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-io-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 



