590 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
16. Artemisia tripartita Rydberg, Mem. N. Y. Bot. Gard. 1: 482. 1900. 
Artemisia trifida Nutt. Trans. Am. Phil. Soc. '7: 398. 1841, not Turez. 1832. 
Type Locaity: “Plains of the Rocky Mountains and Oregon.” Collected by Nuttall. 
Rance: Washington to Wyoming and California. 
SPECIMENS EXAMINED: Wenache, Whited 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 pistripuTION: Arid Transition. 
17. Artemisia absinthium L. Sp. PI. 2: 848. 1753. WorMwoop. 
TyPE LOCALITY: European. 
SPECIMENS EXAMINED: Pullman, Burnham, August 6, 1901; Piper, 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 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 Locauity: ‘Ad Columbia River.’’ Collected by Douglas. 
Rance: British Columbia to Wyoming, Arizona, and California. 
SPECIMENS EXAMINED: Ellensburg, Elmer 400; Wenache, Whited 166; upper Naches 
River, Henderson, June 3, 1892; Klickitat County, Howell; Wilbur, Henderson, July 17, 
1892; Wilson Creek, Sandberg & Leiberg, June, 1893; Coulee City, Lake & Hull 731, Crab 
and Wilson creeks, Sandberg & Leiberg 247; Spokane, Sandberg, Heller, & MacDougal 930; 
Palouse River, Lyall ; without locality, Vasey 543; Rattlesnake Mountains, Cotton 695. 
ZONAL DISTRIBUTION: Upper Sonoran. 
ARNICA. 
Basal leaves cordate, long-petioled. 
Heads rayless; herbage villous and viseid.......------------ 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. A. latifolia. 
Leaves small, crenate-dentate, firm.........---- 5. A. betonicaefolia. 
Basal leaves not cordate, short-petioled. 
Heads rayless ........-.-..--------- 2-22 ee ee ee ee eee 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, this covered with 
a reddish tomentum.............-...... 7. A. peduneulata. 
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. amplericaulis. 
