PI.ANTS PROM ARIZONA. 21 



mostly with about 3 large heads ; involucres V^ inch high and 

 much broader, floccose-tomentulose like the pedicels and stems ; 

 rays broad and short, deep yellow, conspicuously toothed at 

 apex. 



Stony knolls at 8,000 feet in the Chiricahui Mountains, 

 Arizona, 1907, J. C. Blumer. Species of the group to which 

 5". Gree7iei and 5'. ionophyllus of California belong, as well as 

 S. Franciscanus of northern Arizona. 



Senecio stygius. Tall plant, glabrous and leafy like the 

 last, only in every way less robust, the root only annual or 

 biennial : lowest leaves not seen, but cauline lyrate-pinnate, 

 embracing the stem by an ample and lacerate stipuliform base : 

 heads quite small, very numerous, slenderly pedicellate, form- 

 ing a large loose subpaniculate corymb 6 or 7 inches across : 

 bracts of the short subcampanulate involucre 12-15, oblong- 

 lanceolate, acuminate : rays yellow, as long as the involucre, 

 not broad at apex and distinctly 3 -toothed : pappus delicate 

 and fragile. 



Grand Canon of the Colorado, J. G. lyemmon. May, 1884. In 

 U. S. Herb., the sheet not numbered. 



Senecio i^athyroides. Tufted perennial, with rigid 

 ascending leafy stems 2 feet high, with a loose cymose panicle 

 at summit : herbage wholly glabrous, the slightly tortuous 

 stems striate and angled, very light-green : leaves all some- 

 what pectinate-pinnate, of 6 or 8 lateral lobes and a terminal, 

 all very narrowly linear, the rachis itself of the same char- 

 acter, even the most reduced and diminutive floral bracts, in 

 the same way pectinate-pinnate, none simple : branches of the 

 cymose panicle naked, tortuous, each ending in about 3 broadly 

 cylindric heads /4 inch high : calyculate bractlets at base of 

 involucre stifHy somewhat ciliolate ; bracts of involucre 20 or 

 more, linear-acuminate, glabrous : rays long and showy, about 

 8-nerved, very obtuse at apex, the teeth obsolete. 



At Pierce's Spring, Arizona, 18 April, 1894, M. K- Jones; 

 his n. 5077 as in U. S. Herb. A plant of the same alliance 

 as ,S. spartioides of Colorado, but with foliage recalling that 

 of wild peas or vetches ; the stem itself, and more so the 



