1921] Smiley: Flora of the Sierra Nevada of California 65 



(a) 205 with this distribution: present in the Sierra Nevada, Southern Cas- 



cades, Northern Cascades, mountains of British Columbia, Northern 

 Eockies, Soutlieru Eockies at least as far south as Colorado, many of 

 them also in the mountains of New Mexico.* 



(b) 154 peculiar to the Sierran region, as defined in this paper. 



(c) 81 common to the Sierra, Southern Cascades, Northern Cascades, and 



mountains of British Columbia. 



(<^) 57 distributed as follows: present in the Sierra Nevada, ranging north- 

 ward through the Cascades to the mountains of British Columbia (a 

 few extending farther north) and present in the Northern Eockies but 

 not reaching the Southern Eockies. 



(e) 47 to be present in the Sierra and extending northward to Mt. Shasta 

 and the mountains of Siskiyou County (a few of the plants included 

 here are also found in the mountains of southern California). 



(/) 40 inhabiting the Sierra and the Southern Cascades, also the mountains 

 of eastern Oregon and southwest Idaho. A few plants of this group 

 are known from the Warner Mountains of Modoc County. 



(g) 32 with this distribution: present in the Sierra and in the Eockies, mainly 

 the Southern Eockies, though a few here included are kno^\Ti to range 

 north to Alberta. The essential fact with regard to this class is that 

 they are not present in the Cascades and mountains of British Columbia. 



(/i) 24 growing in the Sierra, mainly on the eastern flank, and on the ranges 

 of the Great Basin and western side of the Cordillera from southwest 

 Montana to western Colorado. 



(i) 24 common to the Sierra and mountains of southern California. A few 

 plants of this group are also found on the desert ranges of southeastern 

 California (White Mountains, Panamint Mountains). 



(j) 18 present in the Sierra and ranging northward through the Cascades to 

 Alaska but not known from the Eocky Mountains (plants mainly of 

 the Alaskan coastal strip). 



It appears that of the total number of kinds of plants now found 

 in the high Sierra, 225 (& plus e plus i) are peculiar to the Calif ornian 

 region, which conforms to the political state except that it includes 

 the outl^'ing spurs of the Sierra Nevada, just east of Lake Tahoe, and 

 a small area in southwest Oregon, which, geologically and, it is 

 believed, biologically, has a closer relationship with the mountains 

 of Siskiyou County than with the balance of the State of Oregon. 



We find then nearly one-third of the boreal flora of the Sierra 

 essentially Calif ornian-; a nearly equal fraction of the total number 

 composed of species of very wide distribution in the Cordilleran and 

 Pacific sections of North America ; and the remainder including plants 

 present in extra-Californian mountain floras but of less extended 

 ranges than the plants of the second group. 



* Southern Cascades: Cascades of Oregon south of and not including Mt. Hood. 

 Northern Cascades: Mt. Hood and Cascades of Washington and British 



Columbia. 

 Northern Eockies: Eocky Mountains north of the Laramie Plains. 

 Southern Eockies: Eocky Mountains south of the Laramie Plains. 



