AND GENERA OF PLANTS. 329 
caule, acute; stem smooth, except towards the summit; flowers in an irregular 
corymb; rays about ten to twelve, as long as the disk; scales of the involucrum 
linear-lanceolate, smooth; achenium pubescent. 
Has. The central chain of the Rocky Mountains, in forests. S. multiradiata, Hoox., Vol. Il, 4 
p. 5, not of Aiton. Closely allied to S. multiradiata, for which it appears to be taken by Hooker 
in Flor. Bor. Am., Vol. II., p. 5, but is, in fact, nearer to some varieties of 8. Virga-urea, having 
pubescent achenia. 
* PRIONOPSIS., 
(ApLopappus. Section I. LEIACHE aa Decand. in part.) 
Capitulum hemispherical, many-flowered; rays numerous, (two or more series, ) 
entire, feminine. Discal florets slender and cylindric, mostly abortive. Stig- 
mas of the ray smooth and very slender, scarcely exserted ; those of the disk 
pubescent, rather ort, filiform and obtuse, somewhat compressed. Recep- 
tacle slightly ie im flat. Involucrum imbricated, of many series of some- 
what agglutinated, squarrose sepals, with leafy palate Achenium short and 
smooth, cylindric-ovoid, contracted at the summit; pappus rigidly setose, 
longer than the florets, scabrous, unequal, about ten of the sete longer and 
thicker ; pappus of the ray shorter and of fewer rays, deciduous.—A stout, oh 
herbaceous biennial, with the habit and entire aspect of Grindelia glutinosa ; 
leaves alternate, ovate, FS iy very conspicuously and distinctly serrate- 
ciliate ; flowers wholly yello w, large, fastigiate; branchlets one-flowered.— 
(The name from apiar, a sam, and ous, resemblance, in allusion to the ele- _ 
gant serratures of the leaves.) 
Prionopsis ciliata. Donia ciliata, Norn. = 
a uli fem: OD nd in one e series; discal florets ¢ i 
ertile, ive-toothed, t Shaler taal rather flat, foveo- - 
