new Genera of Composita. ` 109 
The involucre may be compared with that of Liatris squarrosa, 
The close alliance of this genus with Aplopappus proper, 
which it appeared to replace in the northern hemisphere, I 
have elsewhere alluded to. But in Mr. Fremont’s collection 
- we have at length a very striking species of true Aplopappus; 
perfectly congeneric with the typical Chilian forms. It was 
gathered among the Mountains of Upper California; and is 
remarkable for its very long and showy rays, as well as for its 
rigid, undulate and tortuose leaves, not unlike some Muti- 
siaceous plants. The latter peculiarity is indicated by the 
specific name. 
APLOPAPPUS TORTIFOLIUS (Torr. & Gray, ined.): fructi- 
culosus, lana decidua tectus et pube brevissima | scabridus ; 
ramis inferne foliosis, apice in pedunculum longum nudum 
monocephalum productis; foliis coriaceis, semiamplexicauli- 
bus, elongato-lanceolatis, spinuloso-dentatis lobatisve, undu- 
latis, vario modo tortis; squamis involucri hemisphserici sub- 
ulato-lanceolatis, imbricatis, granuloso-scabridis, extimis tomen- 
loso-canescentibus ; ligulis (ut videtur flavis) 30-40 linearibus, 
prelongis ; pappo rufescente; acheniis sericeo-villosis. 
Of the tribe Senecionidez there are several novel plants, 
Which are not in sufficiently good state for satisfactory deter- 
mination. I notice, however, a new Balsamorhiza, unless it ^ 
should prove to be a form of B. deltoidea, Nutt., and what 
appears to be a new Cheenactis. There is also an Actinella, 
Which is perhaps a variety of A. Torreyana, with the heads 
immersed among the leaves, "The printing of the third part 
of the Flora of North America was arrested at a point which 
Just excluded the account of the most showy known species of 
this genus; one which Mr. Fremont collected in his first 
Journey, On the Wind River Chain of the Rocky Mountains, 
Dear the line of perpetual snow. I may be excused, therefore, 
or inserting its specific character in this place. 
Acrinetia GRANDIFLORA (Torr. & Gray, ined.) : depressa, 
“tomentosa ; caulibus numerosis e caudice crassa, simpli- 
