590 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



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

 Artemisia trifda Nutt. Trans. Am. Phil. Soc. 7: 398. 1841, not Turcz. 18;i2. 



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, NuttaU; Wenache Mountains, Cotton 1793. 



Zonal distribution: Arid Transition. 



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

 Type locality: European. 



Specimens examined: P^ullman, Bwrn^m, August 6, 1901; Piper, August, 1903. 

 This species seems to he spreading rapidly. 



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

 Tolmie " specimen of the Synoptical Flora having really been collected «n the "E. side Rky. 

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



TETRADYMIA. 



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



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



Range: British Columbia to Wyoming, Arizona, and California. 



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

 River, //e/k/crson, June 3,1892; Klickitat County, Howell; Wilbur, Henderson, July 17, 

 1892; Wilson Creek, Samlherg cfe Leiberg, June, 1893; Coulee City, Lake cfe Hull 731 ; Crab 

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

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



Zonal distribution : Uppt>r Sonoran. 



ARNICA. 

 Basal leaves cordate, long-petioled. 



Heads raylcss; licrbage villous and viscid 1. A. discoidea. 



Heads radiate. 



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



Herbage glabrous. 



Akenes atomiferou.s-glandular; leaves often similarly 



glandular on both sides 3. A. gracilis. 



Akenes glabrous or nearly so. 



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



Leaves small, crenate-dentate, firm 5. A. betonicaefolia. 



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-glaiulular, upper leaves much re- 

 duced. 



Stems with corm-like base, this covered with 



a reddish tomentum 7. A. pedunculata. 



Stems from horizontal rootstocks 8. A.fulgens. 



Herbage atomiferous-glandular or glandless; up- 

 per leaves but little reduced 9. A. aurantiaca. 



Pappus fuscous, subplumose. 



Upper .surface of leaves glabrous, sticky. 



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



