300 COMPOSITE STBNOTUS. 



nent beneath : heads paniculate, terminating short branchlets or sotoe- 

 times rather congested : involucre obovate, 4-5 lines high, its bracts broad- 

 ish-linear, imbricated in several ranks, the outer successively shorter, the 

 short tips merely mucronate-acute: rays about 10 : style appendages lan- 

 ceolate, rather obiuse, about as long as the stigmatic portion : pappus 

 barely sordid. Base of the Casca e Mountains oi Oregon and Washington. 



P. teunicaiilis Aplopappus tenuicaulis Eaton Bot. King. 16. Silky-to- 

 mentose or at length nearly glabrous stems 6-1 ?> inches long, very slender, 

 curved and ascending from a fusiform caudex: leaves all narrowly lanceo- 

 late, rather rigid, the radical 2-3 inches long, 2-3 lines wide, entire or 

 sparingly denticulate, narrowed into a very short petiole; cauiine ones 

 sessile by a dilated base: heads small, 2-6, racemose, on slender peduncles : 

 involucre hemisplierical, the broadly oblong scales tomentose on the back 

 and rather obtuse rays about 20: disk-flowers numerous: style-branches 

 linear-lanceolate, hispid, twice as long as the stigmatic portion : achenes 

 silky-villous; pappus white, of unequal almost plumulose capillary brist- 

 les. In alkaline meadows. Eastern Oregon to Nevada. 



8 STENOTUS Nutt, Trans. Am. Phil, Soc. vii, 334. 



JDwarf herbaceous plants with linear or lanceolate 1-3-nerved 

 rigid persistent entire alternate or crowded leaves and middle- 

 sized heads of yellow flowers. Involucre hemispherical, its 

 scales oblong-ovate to orbicular, 1-nerved, membranaceous with 

 scarious margins, of equal or moderately unequal length, closely 

 appressed and imbricated. Receptacle flat, alveolate-toothed. 

 Heads many-flowered, radiate. Rays S-12, ligulate, pistillate, 

 oval to oblong : disk corollas perfect, dilated toward the summit, 

 deeply 5-toothed, Style branches broad and flat with the pu- 

 bescent appendages various in form. Aohenes oblong-turbiuate, 

 densely silky villous. Pappus commonly bright wite, of num- 

 erous soft unequal densely scabrous- capillary bristles. 



S. Lyallii Aplop'ppus LyalUi Oray. Viscid puberulent: stems 6-12 in- 

 ches high, equally leafy up to the head : leaves obovate-spatulate to ob- 

 lanceolate: heads solitary at the ends of the stem or branches, radiate: 

 involucre hemispherical 6 lines high, glandular, its bracts acute, sometimes 

 2 or 3 of the outermost oblong and more foliaceous : rays 15-20, conspicuous: 

 style appendages not longer than the stigmatic portion : achenes and 

 ovaries glabrous or nearly so. Alpine region of eastern Oregon to British 

 Columbia, Montana and Colorado. 



S. lanuginosus Greene Eryth. ii, 72. Aplopappus laniigin'^sm 

 Gray. Floccose-tomentose : stems 8-10 inches high from creeping root- 

 stocks, leafy : leaves soft, narrowly spatulate or the upper linear, the 

 sparse uppermost almost filiform, 1-2 inches long: heads solitary, termin- 

 al, radiate, many-iiowered : involucre 6 lines high; its bracts lanceolate, 

 acute or acuminate thin, nearly equal in 2 series, outer barelv greenish: 

 style appendages elongated-subulate : achenes sericeous-canescent Al- 

 pine in the mountains of eastern Oregon and Washington to Montana 



S Brandegfei. Aplopappus Brandegei Gray. Stems 8-li ' inches high 

 from a tufted caudex, cinereous-pubescent or puberulent, and the involucre 

 lanuginose- tomentose: radica leaves obovate or spatulate or roundish, 6-8 

 lines long, contracted into a slender petiole ; eauline few and sparse, 

 small, h lines long, oblong or lanceolate : involucre 3-4 lines high, its 

 lanceolate bracts loose, neaily equal: style appendages trianaular-subu- 

 late : young achenes hirsute-pubescent : pappus rather scanty Moun- 

 tains of Washington in the Yakima district. 



