Set^ecio. COMPOSITiE. 441 



t t Leaves sharply serrate-toothed : heads radiate. 



18. S. triangularis (Hook.): glabrous throughout; stem tall; simple, 

 striate, leafy; leaves deltoid-triangular-lanceolate, acuminate, very sharply 

 and coarsely toothed, petioled ; heads (large) in a fastigiale compound 

 corymb ; bracteoles and calyculate scales few, linear-subulate ; scales of the 

 cylindraceous involucre about 15, linear, sphacelate at the tip; rays 10-12; 

 achenia glabrous.— iJoo^-./ ft. Bor.-Am. 1. p. 332, /. 115; DC l c. p. 432. 



/3. smaller; leaves less acuminate, and less deeply and sharply toothed. 



Moist prairies among the Rocky Montains, between lat. 52° and 55°, 

 Drummond! p. "Wind River Chain of the Rocky Mountains, about lat. 42°, 

 at the altitude of 7000 feet, Lieut. Fremont! — A stout handsome species : the 

 leaves about 3 inches long, unequally and incisely toothed, on distinct petioles, 

 tapering from the remarkably truncate base to the acuminate apex. Heads 

 half an inch long. Achenia not striate. 



19. 5i. Serra (Hook. 1. c.) : herbaceous, erect, very glabrous ; stem stri- 

 ate ; leaves petioled, broadly lanceolate, acuminate, strongly and sharply 

 toothed, mostly cordate at the base ; the uppermost linear-lanceolate, acumi- 

 nate at both ends ; heads numerous in a compound corymb; the involucre 

 furnished with linear-subulate accessory scales ; rays 6-7, linear, remote, 

 twice the length of the involucre ; achenia glabrous. DC. (under the fol- 

 lowing name.) — S. longidentatus, DC. prodr. 6. p. 418. 



Oregon; "common on the banks of the Wallawallah, Flathead, and 

 Spokan Rivers, (2-3 feet high)," Douglas. — Flowers rather small, very nu- 

 merous, in a dense corymbose panicle. Scales of the involucre scarcely 

 sphacelate at the tip. Hook. — While we adopt the anterior name of Hooker, 

 we copy the character of De CandoUe ; who alone has described the lower 

 leaves. It is doubtless nearly allied to S. Sarracenicus. 



20. S. Andinus (Nutt.) : glabrous; stem angled, very leafy; leaves linear- 

 lanceolate, sharply denticulate, acute at both ends, subsessile ; heads (small) 

 cylindraceous, forming a compound paniculate corymb; bracteoles and caly- 

 culate scales few, subulate-setaceous ; rays 6-8, the disk-flowers about 20 ; 

 achenia glabrous. — Nutt. ! in trans. Amer. phil. sac. I. c. p. 409. 



Vallies of the higher Rocky Mountains (lat. 41°), about 6000 feet above 

 the level of the sea, Nuttall! July. — A foot high. Leaves 3-5 inches long, 

 a half to three-fourths of an inch wide. Corymb often irregular. Nutt.— 

 May not this be a subalpine form of the preceding ? 



t t t Leaves toothed : rays none. 



21. S. rapifolius (Nutt.) : very glabrous throughout ; stems angled, pani- 

 culately branched, leafy ; leaves thickish, oblong, unequally and very 

 sharply toothed ; the radical and lowest cauline oval or obovate-oblong, nar- 

 rowed into a winged petiole, and often sparingly incised at the base ; the 

 upper clasping by a subcordate base; heads (small) in numerous small co- 

 rymbs, on short many-bracteolate pedicels, slightly calyculate ; the calycu- 

 late scales and bracteoles very small and subulate ; scales of the cylindra- 

 ceous about 15-flowered involucre 8-10, oblong, thickish ; rays none ; achenia 

 glabrous. — Nutt. ! in trans. Amer. phil. soc. I. c. p. 409. 



Upper branches of the Platte near the Rocky Mountains, Nuttall ! Sweet- 

 Water River and North Fork of the Platte, Lieut. Fremont! Aug. — Plant 

 6-20 inches high. Cauline leaves 3-4 inches long, 1-2 wide, obtuse or acute, 

 somewhat fleshy. Heads much smaller than in S. Cacaliaster. Scales of 

 the involucre thickish, with hyaline margins, not sphacelate. Pappus rather 

 shorter than the yellow corolla. Achenia striate. 



22. S. aronicoides (DC.) : stem herbaceous, simple, arenose-birsute ; 



VOL. II. — 56 



