590 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



16. Artemisia tripartita Rydbcrg, Mem. N. Y. Bot. Gard. 1: 432. 1900. 

 Ariemisia trifida Nutt. Trans. Am. Phil. Soc. 7: 398. 1841, not Turcz. 1S32. 



Type locality: "Plains of the Rocky Mountains and Oregon." Collected by Nuttall. 



Range: Washington to Wyoming and California. 



Specimens examined: Wenache, Whked 1339; Rattlesnake Mountains, Cotton 482; 

 Okanogan River, Cooper; near Deep Creek Falls, Watson 229; Columbia and Lewis River 

 Plains, Nuttall; Wenache Mountains, Cotton 1793. 



Zonal distribution: Arid Transition. 



17. Artemisia absinthium L. Sp. PI. 2: 848. 1753. Wormwood. 

 Type locality: European. 



Specimens examined: Pullman, iJwvTi/wzm, August 6, 1901 ; Pi /;?/•, August, 1903. 

 This species seems to be spreading rapidly. 



Artemisia richardsoniana Besser does not occur in Washington, the "Mt. Rainier 

 Tolmie " specimen of the Synoptical Flora having really been collected on tlie " E. side Rky. 

 Mts., Burke," as noted by Dr. Gray on the sheet in the Gray HerbariuuL 



TETRADYMIA. 



1. Tetradymia canescens DC. Prod. 6: 440. 1837. 



Type locality: "Ad Columbia River. " Collected by Douglas. 



Range: British Columbia to W3'oming, Arizona, and California. 



Specimens examined: Ellensburg, Elmer 400; Wenaclie, Whited 166; upper Naches 

 River, Henderson, June 3,1892; Khckitat County, Howell; Wilbur, Henderson, July 17, 

 1892; Wilson Creek, Sandberg & Leiberg, June, 1893; Coulee City, Lake tfc Hull 731 ; Crab 

 and Wilson creeks, Sandberg cfc Leiberg 247; Spokane, Sandberg, Heller, <& MacDougal 930; 

 Palouse River, Lyall ; without locality, Vasey 543; Rattlesnake Mountains, Cotton 695. 



Zonal distribution: Upper Sonoran. 



ARNICA. 



Basal loaves cordate, long-petiolcd. 



Heads rayless; herbage villous and viscid 1. A. discoidea. 



Heads radiate. 



Herbage pubescent, the stems hirsute or villous 2. A. cordifolia. 



Herbage glabrous. 



Akenes atomiferous-glandular; leaves often similarly 



glandular on both sides 3. A. gracilis. 



Akenes glabrous or nearly so. 



Leaves large, usually dentate, thin 4. .4. latifolia. 



Leaves small, crenatc-dentate, firm 5. A. bctonicaefolia. 



Basal leaves not cordate, short-petioled. 



Heads rayless • 6. A. parryi. 



Heads radiate. 



Leaves dentate or denticulate, mostly rather broad. 

 Pappus whitish, barbellate. 



Herbage viscid-glandular, upper leaves much re- 

 duced. 



Stems with corm-like base, tiiis covered with 



a reddish tomentura 7. A. pedunculata. 



Stems from horizontal rootstocks 8. A.fulgrns. 



Herbage atomiferous-glandular or glandless; up- 

 per leaves but little reduced 9. A. aurantiaca. 



Pappus fuscous, subplumosc. 



Upper surface of leaves glabrous, sticky. 



Stem leaves ovate or ovate-oblong 10. A. amplexicaulis. 



