300 COMPOSITE STENOTUS. 



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

 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 obtuse, about as long as the stigmatic portion : pappus 

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



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

 mentose or at length nea'rly 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 hemispherical, the broadly oblong scales tomentose on the back 

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

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

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

 les. In alkaline meadows, Eastern Oregon to Nevada. 



8 STENOI US Nutt, I rans. Am. Phil, Soc. vii, 334. 



Dwarf herbaceous plants with linear or. lanceolate 1 3-nerved 

 rigid persistent entire alternate or crowded leaves and middle- 

 si::ed 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. liays S 12, ligulate, pistillate, 

 oval to oblong: disk corollas perfect, dilated toward the summ.t, 

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

 bescent appendages various in form. Achenes oblong-turbinate, 

 densely silky villous. Pappus commonly bright w ite, of num- 

 erous soft unequal densely scabrous capillary bristles. 



S. Lyallii Aplop ppus Lyallii Gray. Viscid puberulent: stems 6-12 in- 

 ches high, equally leafy up to the head: leaves obovate -spat ulate 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 15-2*', conspicuous : 

 style appendages not longer than the stigmatic portion : achenes and 

 ovaries glabrous or nearly so. Alpine region of eastern i >regon to British 

 Columbia, Montana and Colorado. 



S. lanuginosus Greene Eryth. ii, 72. Aplopappus lanngiri< su 

 Gray. Floccose-tomentose : sterns 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-flowered: involucre 6 lines high; its bracts lanceolate, 

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

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

 pine in the mountains of eastern Oregon and Washington to Montana 



S Brandegei. Aplopappus JSrandegei Gray. Stems 8-1" 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; cauiine few and sparse, 

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

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

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

 tains of Washington in the Yakima district. 



