Artemisia ludoviciana subsp. incompta (Nutt.) Keck

Artemisia incompta Nutt. Trans. Am. Phil. Soc. II. 7: 400 1841. Artemisia discolor incompta A. Gray, Syn. Fl. N. Am. 1-: 373. 1884.
A perennial, with a cespitose rootstock; stem glabrous, green, striate, simple, 3-5 cm. long; leaves subsessile, obovate in outline, pinnately divided to near the midrib, green and glabrate or slightly floccose when young above, finely white-tomentose beneath, 4—6 cm. long; lobes at least of the lower leaves again cleft or toothed, with lanceolate lobes or teeth ; heads usually many in a narrow panicle, at first nodding, erect in age; involucre hemispheric, 3 mm. high, 3-4 mm. broad; bracts about 12, in about 3 series, glabrate or nearly so, yellowish; the outer ovate, half as long as the innermost; inner bracts elliptic, broadly scarious-margined, obtuse; ray-flowers 5-8; corollas 1.5 mm. long; disk-flowers 20-25; corollas 2 mm. long; achenes fully 1 mm. long.
Type locality: In the central chain of the Rocky Mountains, in Thornberg's Pass [Wyoming?].
Distribution: Montana and British Columbia to Utah and Colorado.

Artemisia arachnoidea Sheldon, Bull. Torrey Club 30: 310 1903.
A perennial, with a branched rootstock or caudex; stems 5-10 dm. high, striate, arachnoidfloccose; leaves Unear-Ianceolate, acuminate or acute, sessile, sparingly floccose but soon glabrate above, permanently floccose beneath, 3-8 cm. long, 5-8 mm. broad, the lower with a few lanceolate short lobes, the upper entire; heads many in a lax panicle, often sub-secund and nodding; involucre hemispheric, about 4 mm. high and 6 mm. broad; bracts about 10, in about 3 series, sparinglj' floccose, j'ellowish-green, the outer ovate, acute, about half as long as the innermost; inner elliptic, acute or obtuse, scarious-margined ; ray-flowers 8-10; corollas 1.5 mm. long; disk-flowers 25-30; corollas bright-yellow; achenes more than 1 mm. long.
Type locality: Banks of the Columbia, one mile west of Vancouver, Washington.
Distjubbtion: Washington, Oregon, and northwestern Idaho.

Artemisia atomifera Piper, Contr. U. S. Nat. Herb. 11: 588 1906.
A cespitose perennial; stem suffrutescent at the base, 6-12 dm. high, striate, somewhat floccose or glabrate; leaves numerous, firm, green and nearly glabrous, but dotted with numerous resinous granules above, white-tomentose beneath, variable in shape, mostly lanceolate in outline, 5-8 cm. long, the lower usually pinnatifid, with 5-7 lanceolate lobes, the upper usually entire; panicles oblong, 1-2 dm. long, dense and narrow, leafy-bracted; involucre campanulate, tomentose, 3-3.5 mm. high, 3 mm. broad; bracts about 10, oval, obtuse; ray-flowers 5-8; corollas 1 mm. long; disk-flowers 5-16; corollas funnelform, glandular-granuliferous, 2 mm. long; achenes 1 mm. long.
T^TE locality: Wawawai, Washington. DiSTRIBUTio.S' : Eastern Washington.

Artemisia prescottiana Besser; Hook. Fl. Bor. Am. 1: 324 1833.
A perennial, branched at the base; stems about 4 dm. high, slender; leaves 3-5 cm. long, pinnatifid or those of the inflorescence entire and filiform; divisions 3-7, filiform, divergent, revolute-margined, green and glabrous above, minutely white-tomentose beneath; inflorescence racemiform, 1-2 dm. long, simple; heads short-peduncled, erect; involucre hemispheric, about 5 mm. broad; bracts 10-12, nearly glabrous, light-brown, shining, the inner broadly obovate, rounded at the apex, scarious on the margins; ray-corollas 2 mm. long, tubular; diskcorollas yellowish, 3 mm. long, with a campanulate throat.
Type locality: Northwest America [Quick Sand River, near the Grand Rapids of the Columbia].
Distribution: Known only from the type loealitv.