Artemisia. COMPOSITE. 423 



Oregon, Mr. Tolmie /—Plant 4-6 inches high. The corolla is nearly glabrous 

 in our arctic specimens, but decidedly hairy at the summit in that from 

 Mount Ranier; in which the raceme is loose, the pedicels strict, but the 

 heads a little nodding. 



26. A. PrescoUiana (Bess.) : suffruticose, branched ; leaves canescent be- 

 neath, with revolute margins, pinnatifid or trifid; the divergent lobes and 

 uppermost leaves linear-filiform; heads spicate, globose, nearly erect; scales 

 of the involucre whh scarious margins, shining, scarcely pubescent; corolla 

 glabrous. Bess, in Hook. I. c, 6^' DC. I. c. 



Oregon, Douglas. — Lower leaves l|-2 inches long. DC. 



27. A. arctica (Less.) : herbaceous ; stem simple ; leaves nearly glabrous; 

 the lower bipinnatifid, (pelioled) ; the lobes linear-lanceolate, incisely toothed ; 

 heads large, globose, racemose, nodding; the apex of the peduncles and the 

 base of the corolla hairy; scales of the involucre ovate-lanceolate, scarious, 

 brown or blackish. DC! I. c. — Less.! in Linneea, 6. p. 213; Hook. Sf Arn. ! 

 hot. Beechey,p. 125; not of Bess. A. Chamissoniana, Bess.! in Hook.fl. 

 Bor.-Am. l.p. 324. 



Arctic coast, Richardson ! to Kotzebue's Sound ! and Unalaschka ! Woods 

 in the Rocky Mountains, lat. 52°, Drummoncl. — According to Hooker, the 

 specimens from the last-named locality are identical with A. Norwegica. 



28. A. glomerata (Ledeb.) : suffruticose, csespitose, silky with white hairs ; 

 leaves on the simple tufted stems 3-parted and many-cleft ; the upper cauline 

 and the bracts cuneiform or oblong, pinnatifid; heads corymbose-capitate, 

 globose, bracteate ; scales of the involucre ovate-lanceolate, sphacelate, un- 

 equally toothed at the apex, whitish on the back ; corolla hairy only at the 

 summit. DC! I.e. — Ledeb. in mem. acad. St. Petersb. 5. p. 564; 

 Less. ! in Linneea, 5, j^- 212 ; Bess. ! in Hook. I. c. 



Kotzebue's Sound, fide Hook. Sf Arn. ! hot. Beeckey, p. 125 : but we 

 doubt whether the sterile tufts (which alone were collected), with densely 

 imbricated, very villous, cuneiform, 3-5 cleft leaves, really belong to this 

 species. 



29. A. globularia (Cham, herb.) : suffruticose at the base, caespitose ; stems 

 simple, hirsute at the summit ; leaves petioled, silky beneath, 3-parted ; the 

 lobes 3-cleft or entire, linear ; heads racemose-capitate, globose ; scales of the 

 involucre oblong-lanceolate, woolly on the back, sphacelate at the apex; 

 corolla glabrous. — Bess, in DC. prodr. 6. p. 116. 



Unalaschka, &c., Chamisso !— Stems 3-5 inches long from a woody 

 caudex. Involucre blackish. Corolla purple. DC 



* * Biennial. 



30. A. biennis (Willd.) : herbaceous, strict, glabrous ; radical and lower 

 cauline leaves bipinnately parted ; the uppermost pinnatifid ; the lobes linear, 

 acute ; those of the lower leaves sharply toothed or incised, of the upper 

 mostly entire ; heads globose, erect, spicate ; the short spikes disposed in a 

 strict leafy panicle.— W^iW^. spec. 3. p. 1842 ; Pursh! fi. 2. p. 522 ; Nutt. ! 

 gen. 2. p. 144 ; Bess. ! in Hook. I. c. ; DC ! prodr. 6. p. 120. A. annua ? 

 Nutt. I. c. 



Ohio ! Illinois ! Tennessee ! and Missouri ! to the Upper Platte ! Sas- 

 katchawan ! and the Mackenzie River ! Aug.-Oct.— Plant 1-3 feet high. 



§5. Receptacle villous {or naked?): heads as in § Abrotanum : achenia 

 acutely ribbed, croioned toith a minute squamelliform pappus ! — Tanaceum, 

 Nutt. 



