;$24 Rydberg : Rocky Mountain flora 



G. Wrightii. G. thermale is closely related to that species and may 

 be regarded as a form thereof by a conservative systematise but 

 the first one named is not. 



At the end of the description of Gnaphalium Wrightii the fol- 

 lowing note is given :"G. thermale E. Nels. Bot. Gaz. 30 : 1 2 1 . 1 900, 

 the description of which is here used." If G. thermale is to be 

 included in G. Wrightii, it is at least not the normal condition of 

 that species and the description of the small G. thermale gives a 

 poor idea of G. Wrightii, which is a tall plant, 3-5 dm. high. To 

 use the description of one species for another is as a rule very 

 unsafe, unless the identity is established without any doubt. 



Gnaphalium albescens Osterh., G. proximus Greene, and G. 

 lagopodloldes Rydb. are not accounted for at all in the New Manual, 

 although they were described from material collected in the region 

 covered by the work. The first, I think, is a pure synonym of G. 

 Wrightii; the other two, as well as G. sulphur escens, are closely 

 related to G. chilense Sprengel {G. Sprengelii H. & A.). All three 

 have the obtuse bracts and subdecurrent leaves of that species. 

 G. proximus was based on Aven & Ellas Nelson 6036 and is closest 

 to G. chilense. The specimens were distributed as G. Sprengelii 

 and are evidently included in G. chilense in the New Manual. If 

 G. sulphurescens should be reduced to synonymy it should be 

 under G. chilense not under G. Wrightii. 



Gnaphalium ullglnosum L. is also omitted, although it has been 

 collected in both Colorado and Utah. 



Gnaphalium angustlfollum A. Nels. is antedated by both G. 

 angustlfolium Lam. and G. angustlfollum Loisel.; but as those 

 species now are referred to Hellchrysum it may be that G. angustl- 

 follum is tenable according to the Vienna Rules. A poor rule 

 indeed, when the validity of the name G. angustlfollum A. Nels. 

 depends upon whether two species of the Old World are kept in 

 Gnaphalium or not. Three years after G. angustlfollum A. Nels. 

 was published, the proposer of that species substituted the name 

 G. exlllfollum, which name is wholly ignored in the New Manual. 



Gnaphalium Williamsii sp. now 



Probably biennial; stem 3-6 dm. high, branched above, loosely 

 floccose ; leaves linear or linear-lanceolate, decurrent, 5-10 cm. long, 



