208 COMPOSITE, (composite family.) 



into a petiole, cauline mostly clasping by a broad subcordate base : heads 3 

 lines high, about 15-flowered: involiicral bracts 8 to 10, narrowly oblong. — 

 Rocky Mountains, Wyoming, about the sources of the Platte. 



= = = Tall, loith corymhosehj ci/mose and radiate heads: leaves nearly raera- 



hranaceous. 



8. S. triangularis, Hook. Rather stout : stem simple, 2 to 5 feet high, 

 bearing several or somewhat numerous heads in a corymbiform open cyme : 

 leaves all more or less petioled and thickly dentate with more or less salient 

 teeth, deltoid-lanceolate, or the lower trianrjular-hastate or deltoid-cordate, and 

 uppermost lanceolate with cuneate base: rays 6 to 12. — From the Saskatch- 

 ewan to Washington and southward in the mountains to Colorado and 

 California. 



9. S. serra, Hook. Strict, 2 to 4 feet high, very leafy, sometimes simple 

 and bearing rather few heads, commonly branching at summit, then bearing 

 numerous corymbosely paniculate smaller heads : leaA^es 4 to 6 inches long, 

 all lanceolate and tapering to both ends, sessile by a narrow base, or the lowest 

 oblong-spatulate and tapering into a short petiole, usually with the whole marcjin 

 thickly serrate or serrulate with very acute salient teeth : rays 5 to 8. — In the 

 Western Reports principally under the name of S. Andinus. Mountains of 

 Colorado to Idaho and Wyoming. 



Var. integriusculus, Gray. Heads smaller, 3 or 4 lines high, and nar- 

 rower, fewer-flowered : leaves minutely serrate or denticulate, or the upper 

 entire, sometimes all entire or nearly so, generally shorter and smaller, or 

 broader and not acuminate. — Synopt. Fl. i. 387. S. Andinus, Nutt. From 

 Wyoming to Oregon and California. 



•w- ••-^ Stem not numerously but somewhat equably leafy up to the inflorescence : 

 leaves all entire or denticulate : involucre fleshy-thickened. 



10. S. crassulus, Gray. A foot or less high, glabrous: stem 5 to 7- 

 leaved, bearing 3 to 8 pedunculate rather large and thick heads : leaves ob- 

 long-lanceolate, apiculate-acute, 2 to 5 inches long ; radical and lowest cauline 

 spatulate or obovate-oblong, narrowed into a short winged petiole ; upper 

 sessile by partly clasping or decurrent base : involucre 40 to 50-flowered, of 12 

 fleshy-thickened but thin-edged bracts, the base also thickened, the whole 

 becoming conical and multangular in fruit : rays about 8. — Proc. Am. Acad. 

 xix. 54. S. integerrimus. Gray, in part ; S. lugens, var. Hookeri, Eaton, in part 

 Subalpine, mountains of Colorado to Utah and Wyoming. 



++ -M. ++ Stems either few-leaved or with the upper leaves reduced in size ; the inflo- 

 rescence therefore naked : none with narrow linear leaves. 

 = Tall and simple-stemmed, with a fibrous cluster of roots : leaves fleshy coria- 

 ceous, all entire or barely denticulate. 



11. S. hydrophilus, Nutt. Very glabrous or smooth : stem robust, 2 to 

 4 feet high, strict : leaves lanceolate ; radical oblauceolate and stout-petioled, 

 sometimes a foot long ; upper cauline sessile or partly clasping : heads numer- 

 ous in a branching cyme: bracts 8 to 12: disk-flowers 15 to 30; rays 3 to 6 

 and small, or none. — In water or very wet ground, from Colorado and Cali- 

 fornia to Montana and British Columbia, 



