PIPER FLORA OF THE STATE OF WASHINGTON. 593 



SppciMENS examined: Mount Rainier, ^Z/e/i 285; Piper 2139; Mount Ad&ms, Suksdorf 

 567; Henderson, August 10, 1892; Howell in 1882; Suksdorf 567; Yakima County, i/erMfer- 

 sow 2298; Y&kima, Region, Brandegee 912; Mount Stuart, £'/mer 1164, 1163; Cascade Moun- 

 tains, 49°, Lyall in 1860; Skagit Pass, Lake t& Hull 736; Stevens Pass, Sandberg cfc Leiberg 

 725; Bridge Creek, Elmer. 



Most of the above specimens were distributed as A. chamissonis Less., a species which 

 apparently does not reach our limits. 



14. Arnica cana Greene, Ottawa Nat. 15: 282. 1902. 

 Arnica foliosa incana Gr&y, Bot. Cal. 1: 416. 1876. 



Arnica incana Greene, Pittonia 4: 169. 1900, not A. incana Pers. 1807. 

 Type locality: Lake Tahoe, CaHfornia. 

 Range: Washington to Cahfornia. 



Specimens examined: Cascade Mountains, Brandegee 139; White Salmon, Suksdorf in 

 1878; Big Klickitat River, Henderson in 1892. 



15. Arnica longifolia D. C. Eaton in Wats. -Bot. King. Explor. 186. 1871. 

 Type locality: "Clover Mts." Nevada. 



Range: Washington? and Idaho to California and Utah. 



Specimens examined: Klickitat County, Suksdorf 5G8, a somewhat doubtful specimen, 

 the akenes hairy as well as glandular. 



The above treatment of the Washington species of Arnica is far from satisfactory. It 

 is probable that further study in the field will compel the recognition of a larger number 

 of species. Collectors should secure large series of specimens and note carefully which 

 characters are constant and which are due to differences in environment. 



PETASITES. 



Alpine plant; leaves ovate or oblong, 5 to 7-lobed, 5 to'lO cm. long 3. P.frigida. 



Lowland plants. 



Leaves broadly sagittate, very coarsely dentate I. P. dentata. 



Leaves reniform-orbicular, 7 to 11-cleft, very large, often 30 cm. or more 



broad 2. P. speciosa. 



1. Petasites dentata Blankinship, Mont. Agr. Coll. Sci. Stud. 1: 64. 1905. 

 Type locality: "The common Rocky Mountain species." 



Range: British Columbia to Hudson Bay south to Colorado. 



Specimens examined: Marshall Junction, Piper, July 2, 1896; Pend Oreille River, Lyall 

 in 1861. 



Zonal distribution: Canadian. 



This species has been generally confused with the entire leaved P. sagittata Pursh of 

 the Hudson Bay region. 



2. Petasites speciosa (Nutt.) Piper, Mazama 2: 97. 1901. 

 Nardosmia speciosa Nutt. Trans. Am. Phil. Soc. 7: 288. 1840. 



Type locality: ''Shady forests of the Oregon and Wahlamet by streams." Collected 

 by Nuttall. 



Range: British Columbia to California. 



Specimens examined: Port Ludlow, Binns; Seattle, Piper 123; Silverton, Bouck 104; 

 Tacoma, Flett 201; upper Nisqually Valley, Allen 54; Larm River, Suksdorf 140; 

 Wenache Mountains, Whited 1341. 



Zonal distribution: Humid Transition. 



This species is entirely different from the eastern P. palmata (Ait.) Gray, with which 

 authors have confused it. 



29418—06 M 38 



