588 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
7”. Artemisia ludoviciana Nutt. Gen. 2: 143. 1818. 
Artemisia gnaphalodes Nutt. loc. cit. 
Artemisia diversifolia Rydberg, Bull. Torr. Club 28: 21. 1901. 
Type Locatity: “On the banks of the Mississippi, near St. Louis; also on the alluvial 
plains of the Missouri.” 
Rance: British Columbia to Michigan, south to California and Texas. 
SPECIMENS EXAMINED: Lake Chelan, Lake & Hull, August 12, 1892; Wenache, Whited 
1338, 11; Yakima, Watt, August, 1895; junction Crab and Wilson creeks, Sandberg & 
Leiberg 337; Sprague, Lake & Hull 725; Spokane, Piper 3519; Elmer 867; Pullman, 
Piper 1586; Salmon River, Horner 342; Rock Lake, Lake & Hull 724; Coulee City, Lake 
& Hull, August, 1892; west Klickitat County, Suksdorf 1610; Toppenish, Cotton 778; 
Ellensburg, Elmer 378; Lake Chelan, Gorman 679; Sheep Springs, Leiberg 944; Walla 
Walla, Wilkes Expedition 944; Fort Colville, Watson 227: Blue Mountains, Horner 296; 
without locality, Vasey 479, 482; Squaw Creek, Cotton 867. 
ZONAL DISTRIBUTION: Arid Transition and Upper Sonoran, 
An exceedingly common species presenting great variability as to leaf contour and 
pubescence. Several such forms have been considered species or subspecies, a disposition 
which seems to us entirely artificial. The plant is often called white sage.”’ 
8. Artemisia atomifera sp. nov. 
Cespitose, often in large clumps; stems suffrutescent, most ly simple up to the inflores- 
cence, 60 to 120 em. high, coarsely striate, canescent or glabrate: leaves numerous, sub- 
sessile, firm, and rather rigid, green and nearly glabrous above, speckled with numerous 
white resinous atoms, closely white-tomentose beneath, excessively variable as to form, 
either all lanceolate and entire or all dentate or laciniate, or the larger ones 5 to 7-pinnately 
divided with narrow lobes, usually the upper ones entire, the lower variously dentate or 
lobed, commonly 2 to 6 cm. long; panicle oblong or somewhat pyramidal, 10 to 20 em. long, 
more or less leafy-bracted, the heads glomerate or spicate on the ascending branches; 
involucre campanulate, canescently tomentose, more or less atomiferous like the leaves, 2 
to 4 cm. high; bracts about 10, ovate, obtuse: flowers 10 to 25 in each head: mature 
akenes linear-oblong, glabrous, destitute of pappus. 
A species with the habit and appearance of A. ludoviciana Nutt., to which it is cl sely 
allied, but apparently well marked by the peculiar atomiferous character of the upper leaf 
surface, The odor is decidedly more pungent than that of A. ludoviciana. I have never 
met the species except in Snake River canyon at Wawawai and Almota. 
The type, in the U.S. National Herbarium, is my no. 6466 from Wawawai, a good series 
of which shows the variability of the foliage. Other specimens were collected at Wawawal 
July 19, 1892, and at Almota under no, 2321. 
9. Artemisia tilesii Ledeb. Mem. Acad. St. Petersb. 5: 568. 1815. 
Artemisia tilesii elatior Torr. & Gr. Fl. 2: 422. 1843. 
Artemisia arachnoidea Sheldon, Bull. Torr. Club 30: 310. 1908. 
Type Locauiry:; “Hab. in Kamtschatka.” 
Rance: Alaska to Oregon. 
SPECIMENS EXAMINED: Mount Stuart, Elmer 1199; Cascade Mountains, Tweedy & 
Brandegee 115, 469; west Klickitat County, Suksdorf 871; Lake Chelan, Lake & Hull, 
August 24, 1892; Olympic Mountains, Piper, August, 1895; Lake Cushman, Piper, August, 
1895: Peshastin, Sandberg & Leiberg 492; Twisp River, Whited, July 20, 1896; near Van- 
couver, Sheldon 11284. 
ZONAL DIsTRIBUTION: Hudsonian and Canadian. 
The type of A. arachnoidea Sheldon seems to me only a form of this variable species. 
10. Artemisia discolor Dougl.; DC. Prod. 6: 109. 1837. 
? Artemisia michauriana Besser, Abrot. 71. 1834. “Ad fluy. Columbiam. Douglas.” 
Artemisia stenoloba Rydberg, Mem. N. Y. Bot. Gard, 1: 432. 1900. 
