388 University of California Publications in Botany [VOL. 9 



401; South Fork of the San Joaquin River, 9,000 feet, Hall and 

 Chandler, July, 1900 ; moist places near Soda Creek, Tulare County, 

 8-9,000 feet, Purpus 1811. 



21. SENECIO 



Stems leafy up to the inflorescence, the leaves all alike, dentate and glabrous. 

 Stems low (not exceeding 1 foot high) ; leaves thick, ovate-spatulate to 

 oblong, coarsely toothed above the middle; heads few or solitary, some- 

 what long-peduncled 1. S. Fremontii var. occidentalis 



Stems taller (2-5 feet high) and usually simple; leaves very thin or mem- 

 branous, yellowish-green, deltoid or hastate, toothed from the base; 



heads numerous, disposed in a corymbif orm cyme 2. S. triangularis 



Stems appearing scapose, the foliage composed of larger basal leaves, the upper 



cauline reduced or wanting and the inflorescence naked. 

 Leaves all entire or few toothed, never pinnatifid. 



Leaf blades %-1.25 inches long; stems 2-15 inches high; petioles not 



winged 3. S. oreopolus 



Leaf blades much longer (34 inches) and stems taller, commonly solitary; 



leaves spatulate, narrowing to winged petioles. 



Stems from rootstocks; leaves strictly basal, serrate; heads small. 

 Leaves and stems with more or less white tomentum ....4. S. scorzonella 



Leaves and stems early becoming glabrate 5. S. Covlllei 



Stems from a fascicle of fibrous roots and bearing leaves to about the 

 middle; leaves denticulate or almost entire; heads of good size 



6. S. lugens var. exaltatus 



Leaves pinnatifid (species allied to S. aureus L.). 



Stems several, 1 foot or taller; cauline leaves reduced but showing evident 



blades; heads several to many. 



Leaves thin or membranous, the basal on petioles no longer than the 



blades; heads usually rayless, orange yellow in color ..7 S. pauciflorus 



Leaves thickish, the basal long petioled; heads radiate; the rays lemon 



yellow 8. S. laetiflorus 



Stems solitary; the upper leaves reduced to bracts; heads small and 

 solitary or 2 or 3 9. S. subnudus 



1. Senecio Fremont! T. and G., var. occidentalis Gray, Bot. Calif., 

 vol. 1, p. 618. 1876. 



Type locality. ' ' Sierra Nevada, on Mount Whitney at 12,500 feet, 

 and S. Fork of Kern River down to 9,800 feet," 



Range. Pacific Coast from Washington to California. 



Zone. Hudsonian and arctic-alpine ; occasionally in the Canadian. 



Specimens examined. Mt. Rose, 10,500 feet, Heller 9914; Bloody 

 Canon, Mono County, Chesnut and Drew, July 20, 1889 ; Inyo County, 

 S. W. Austin 337 ; Yosemite Park, J. B. Lembert 1001 ;* Kaiser Crest, 



* Dr. Greene considered the Sierran material, here referred to the var. occi- 

 dentalis, to be specifically distinct from the typical form present in the Kocky 

 Mountains (see Pitt., vol. 4, p. 122. 1900) and assigned as distinguishing char- 

 acters, longer and narrower glabrous achenes as contrasted with shorter pubescent 

 achenes for the typical form; examination of such material as came to my notice 

 failed to bear out the statement as to the relative length of the achenes but there 

 does seem to be general agreement among the West Coast specimens in the matter 

 of the hairiness of the achenes: these in the Sierran collections, and the same 

 is true for the Oregon and Washington collections seen by me, are usually glabrous, 

 but not exclusively so, for Lembert 's plant, cited above, shows some achenes with 

 a sparse hispid pubescence. 



