COMPOSITE. (COMPOSITE FAMILY.) 207 



+ -M- Not alpine, with leafy stems afoot or so high. 



3. S. megacephalus, Nutt. About a foot high, loosely floccose-woolly, 

 tardily glabrate, leafy : leaves entire, lanceolate, or the radical spatulate-lan- 

 ceolate and tapering into a petiole, and uppermost cauline attenuate, thickish : 

 heads 1 to 3, short-ped uncled, 8 lines to an inch high : involucre calyculate by 

 some very loose and subulate elongated accessory bracts : rays over inch 

 long. From the mountains of Idaho to the Rocky Mountains near the Brit- 

 ish boundary. 



-i- +- Heads rayless, nodding : some sparse crisped hairs in place oftomentum. 



4. S. Bigelovii, Gray. Robust, 2 or 3 feet high, leafy up to near the 

 racemiform or simply paniculate inflorescence, at length glabrate : leaves from 

 elongated-oblong to lanceolate, denticulate or dentate, acute or acuminate; 

 radical and lower cauline 3 to 6 inches long, abrupt at base and naked-peti- 

 oled, or tapering into a winged petiole or partly clasping base ; upper lanceo- 

 late with partly clasping base : heads in small plants few or solitary. Pacif. 

 R. Rep. iv. 111. Includes also var. Hallii, Gray. Mountains of Colorado, 

 New Mexico, and Arizona. 



* # Heads middle-sized or small, half-inch or less, 

 *- Nodding, rayless: leafy-stemmed. 



5. S. ceriums, Gray. Quite glabrous, 2 or 3 feet high : leaves lanceolate 

 or the larger oblong-lanceolate, entire, denticulate, rarely with a few scattered 

 coarser teeth, all tapering at base into a barely margined petiole, or upper 

 into a narrowed not clasping base : heads (4 to almost 6 lines long) several 

 or numerous in the panicle, most of them decidedly nodding: flowers pale 

 yellow. Am. Jour. Sci. n. xxxiii. 10. Mountains of Colorado, wholly below 

 the alpine region. 



-i- - Heads erect, mostly radiate. 



+* Stems numerously and nearly equably leafy to the top: leaves from entire to 

 laf.iniate-dentate, never divided or dissected, nor narrowly linear : glabrous or 

 very early glabrate. 



= Low, alpine: heads subsolitary, radiate. 



6. S. Fremonti, Torr. & Gray. Many-stemmed from a thickish caudex, 

 a span to a foot high : leaves thickish, from rounded-obovate or spatulate to 

 oblong, 1 to 2 inches long, obtuse, obtusely or acutely dentate, sometimes even 

 pinnatifid-dentate ; lower abruptly contracted into a winged petiole ; upper- 

 most sessile by broadish base : heads | inch high : rays 3 to 5 inches long. 

 Fl. ii. 445. Alpine regions, from the British boundary to S. Colorado, Utah, 

 and California. 



Var. OCCidentalis, Gray. More slender, with rounder leaves and heads 

 longer-peduncled ; in high alpine stations becoming very dwarf, and flowering 

 almost from the ground. Bot. Calif, i. 618. Mountains of N. Wyoming, 

 Montana, and California. 



= = Rather low, with numerous cymosely paniculate and small heads, always 



rayless. 



7. S. rapifolius, Nutt. About a foot high: leaves ovate or oblong, 

 throughout very sharply and unequally dentate, rather fleshy ; radical tapering 



