372 University of California Puhlications in Botany [Vol. 9 



9. Erigeron compositus var. trifidus Gray, Proc. Am. Acad., vol. 



16, p. 90. 1881. 



E. trifidus Hook., Fl. Bor. Am., vol. 2, p. 17, t. 120. 1834. 



E. flabellifolius Rydb., Bull, Torr. Bot. Club, vol. 26, p. 545. 1899. 



Type locality. — ^" Barren places among the Rocky Mountains" of 

 Canada. 



Range. — Alberta to Colorado, west to the Cascades and Sierra 

 Nevada. Mountains of southern California (with rays obsolete — see 

 note below). 



Zone. — Arctic-alpine, rarely in the Hudsonian. 



Specimens examined. — Castle Peak, near the highest point, 9,000 

 feet, Heller 7103 ; same locality, dry rocks at 8,500 feet, Sonne, July, 

 1892; Mt. Tallac, Tahoe, Setchell and Dobie, July 6-21, 1901; Mt. 

 Rose, Kennedy 1172;* Mt, Dana, 12,000 feet, Bolander 5081; same 

 locality, up to 12,200 feet, Hall and Babcock 3614a; Dicks Peak, 

 Tahoe, 9,900 feet. Smiley 429 ;t Mt. Gibbs, Yosemite, 12,000 feet, 

 Smiley 778 ; Mt. Goddard, 12,500 feet. Hall and Chandler 665 ; Mt. 

 Lyell, Cassiope Crest, 11,000 feet. Hall and Babcock 3572; Mt. Dana, 

 above the saddle, Chesnut and Drew, July 17, 1889 ; Farewell Gap, 

 Tulare County, 10,700 feet, Purpus 5273; Cirque Peak, Tulare 

 County, 12,000 feet, Hall and Babcock 5500; Mt, Whitney, 12,500 

 feet. Hall and Babcock 5538. • 



10. Erigeron tener Gray, Proc. Am. Acad., vol. 16, p. 91. 1880. 

 E. caespitosus var. tener Gray, Bot. Calif., vol. 1, p. 328. 1876. 



Type locality. — "Summit of Silver Mountain near Ebbett's Pass, 

 alt. 11,000 feet." Brewer 2043. 



Range. — Sierra Nevada and mountains of Nevada. 



Zone. — Canadian and Hudsonian. 



Specimens examined. — Silver Mountain, Alpine County, 11,000 

 feet. Brewer 2043 ; mountains about the headwaters of the Sacra- 

 mento, 8,000 feet, Pringle, August 19, 1881. 



In the Synoptical Flora the range of this species is given so as to 



* This collection more nearly approaches var. piniwtiseetti.s Gray, a form of the 

 Colorado mountains, distinguished by the leaves pinnately parted into linear 

 segments, than any other seen from within our limits. 



t Some of the specimens cited above differ from the typical form with numerous 

 rays, by having the rays abortive or in some heads apparently entirely wanting; 

 this is the var. discoidcus Gray (Am. Jour. Sci. II, vol. 33, p. 237. 1862), but 

 there seems to be every conceivable gradation from heads -with the normal number 

 of well developed rays to the eradiate condition; my No. 429 represents this ray- 

 less state. 



