324 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 systematist, but 
the first one named is not. 
At the end of the description of Gnaphalium Wrightw the fol- 
lowing note is given: ‘'G. thermale E. Nels. Bot. Gaz. 30: 121. 1900, 
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. 
lagopodioides 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. sulphurescens, 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 & Elias Nelson 6036 and is closest 
to G. chilense. The specimens were distributed as G. Sprengelit 
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 uliginosum L. is also omitted, although it has been 
collected in both Colorado and Utah. 
Gnaphalium angustifolium A. Nels. is antedated by both G. 
angustifolium Lam. and G. angustifolium Loisel.; but as those 
species now are referred to Helichrysum it may be that G. angustt- 
folium is tenable according to the Vienna Rules. A poor rule 
indeed, when the validity of the name G. angustifolium A. Nels. 
depends upon whether two species of the Old World are kept in 
Gnaphalium or not. Three years after G. angustifolium A. Nels. 
was published, the proposer of that species substituted the name 
G, exilifolium, which name is wholly ignored in the New Manual. 
Gnaphalium Williamsii sp. nov. 
Probably biennial; stem 3-6 dm. high, branched above, loosely 
floccose; leaves linear or linear-lanceolate, decurrent, 5-10 cm. long, 
