72 



GENUS ARTEMISIA. 



11a. Artemisia vulgaris tilesi (Ledebour). — Stems 2 to 6 dm. high, from rootstocks; 

 lower leaves ovate in outline, cut nearly to the midrib into unequal lobes, these often 

 again cleft or toothed; principal leaves ovate or broadly elliptic in outline, 7 to 17 cm. 

 long, 3 to 7 cm. wide, cleft more than half-way to the midrib into unequal segments 

 which are either entire or with a few lobes or teeth, both primary and secondary lobes 

 all pointing forward and acute or acuminate (except in an occasional plant, as in A. tilesi 

 arctica Besser, minor variation 84, in which the lobes are broad and obtuse), the leaves 

 of the inflorescence less cut or often entire, all leaves green and glabrous or only puberu- 

 lent above, densely and permanently white-tomentose beneath, the margins narrowly 

 revolute; inflorescence in the original form dense, spike-like, 0.5 dm. or less long by about 

 2 cm. broad, commonly overtopped by the leaves, but in the more common form (minor 

 variation 85, A. tilesi elatior Torrey and Gray) the inflorescence an elongated panicle 1 

 to 3 dm. long by 2 to 6 cm. broad and much exceeding the leaves; involucre hemispheric, 

 4 to 5 mm. high, 5 to 8 mm. broad, glabrous and green or yellowish to puberulent and 

 more or less canescent, or reddish, mostly 30- to 70-flowered. {A. tilesi Ledebour, Mem. 

 Acad. St. Petersb. 5:568, 1805.) 



Eastern Siberia and arctic North America east at least to Hudson Bay, south to Mon- 

 tana, northeastern Nevada, and Oregon. Type locality, Kamchatka. Collections : King 

 Point, Arctic America, June 28, 1906, Lindstrom (NY) ; Arctic shore between Mackenzie 

 and Coppermine Rivers, Richardson (NY, variation 84 with short, obtuse leaf-lobes, 

 A. tilesi arctica Besser); vicinity of Norton Sound, Alaska, 1899, Rhodes, Newhall, and 

 Giacomini (UC); vicinity of Norton Sound, Alaska, 1900, MacGregor (UC, typical); 

 St. Paul Island, Bering Sea, Macoun 94006 (Gr) ; St. Lawrence Island, Bering Sea, August 

 15, 1891, Macoun (Gr); Arakamtchetchene Island, Bering Straits, 1853-56, Wright (Gr); 

 Unalaska, Bering Sea, Macoun 20625 (NY, type collection of A. unalaskensis Rydberg, 

 minor variation 87) ; Lake Iliamna Region, Alaska, Gorman 281 (Gr, NY, US, type col- 

 lection of A. gormani Rydberg, minor variation 24); White Pass, Yukon, Eastwood 899 

 (SF) ; Skaguay, Alaska, Eastwood 772 (SF); Nome, Alaska, Blaisdell 80 (NY, UC, minor 

 variation 24, A. gormani Rydberg); Dawson, Canada, Eastwood 455 (SF); Churchill, 

 Hudson Bay, Macoun 79263 (Gr, with small heads and narrow inflorescence of minor 

 variation 85, A. tilesi elatior Torrey and Gray, but the inflorescence leafy); Chilli wack 

 Valley, British Columbia, Spreadbrough (Geological Survey of Canada 76930, NY); 

 Stehekin, eastern Washington, Griffiths 195 (NY, minor variation 85, A. tilesi elatior 

 Torrey and Gray); Chiwankum Lake, Wenatchee Forest, Washington, Eggleston 13697 



