1921] Smiley: Flora of the Sierra Nevada of California 395 



24. ARTEMISIA 



Plants shrubby. 



Most of the leaves 3-lobed or 3-parted, cuneate at the base; involucres 5-10 



flowered. 

 Most of the leaves merely lobed; heads very numerous; tall shrubs 



1. A. tridentata 



Most of the leaves 3-parted, the divisions obovate; heads fewer; low de- 

 pressed high montane shrub 2. A. arbuscula 



Most of the leaves entire; involucres 10-14 flowered. 



Pubescence loose and scurfy; leaves narrowly linear, acute, rarely lobed; 

 heads about 14-fiowered, numerous, often with long linear herbaceous 



bracts 3. A. Bolanderi 



Pubescence of minute closely adhering hairs; leaves usually spatulate- 

 lanceolate or linear, entire and obtuse, or sometimes 3-lobed; heads 



10-14 flowered 4. A. Rothrockii 



Plants herbaceous or merely woody at base. 



Leaves soft-hairy, the basal finely divided into linear segments, the upper 



cauline reduced to trifid bracts 5. A. norvegica 



Leaves green above, whitened below with cottony tomentum, cuneate, with 



3 to 5 acute dentate lobes at the broad summit 



6. A. Tilesii var. unalaschensis 



1. Artemisia tridentata Nutt., Trans. Am. Phil. Soc. II, vol. 7, 



p. 398. 1841. 



Type locality. ' ' Plains of the Oregon, and Lewis River. ' ' 



Range. British Columbia to South Dakota, south to Lower Cali- 

 fornia and New Mexico. 



Zone. Upper Sonoran, rising into the Canadian. 



Specimens examined.- Tallac, Tahoe, Dudley, June 8, 1893; Suzy 

 Lake trail, Tahoe, McGregor 197 ; near Summit Station, E. L. Greene, 

 October 14, 1874 ; Angora Peak trail over the moraine south of Fallen 

 Leaf Lake, Tahoe, 7,100 feet, Smiley 20; Mono Pass, Bolander 6150; 

 Sonora trail, east side of the Sierra Nevada, Brewer 1863; Crescent 

 Lake, Mariposa County, Congdon, August 14, 1895; mountain slopes 

 along Little Kern River, Tulare County, 9,400 feet, Purpus 3001. 



2. Artemisia arbuscula Nutt., Trans. Am. Phil. Soc. II, vol. 7, p. 



398. 1841. 



Type locality. ' ' On the arid plains of Upper California, on Lewis 

 River. ' ' 



Range. Central Rocky Mountains west to Oregon and the Sierra 

 Nevada. 



Zone. Upper Sonoran to Canadian at least. 



Specimens examined. Mt. Rose, 10,200 feet, Heller 9883 ; high 

 on Mt. Stanford (Castle Peak), Hooker and Gray in 1877; high 

 Sierras west of Summit Station, E. L. Greene 449 ; ridge south of 



