420 COMPOSIT.E. Artemisia. 



Rocky situations on the Missouri from White River to the mountains, 

 Nuttali! Mouth of Teton River, -Mr. Nicollet! — A low, "very odorous" 

 species ; the leaves 3-4 inches long, 2-3 lines wide, tapering to an acute 

 point. 



16. A. discolor (Dougl.) : suffrulicose, erect or ascending ; leaves some- 

 what bipinnatifid, canescently tomentose beneath ; the lobes mostly linear, 

 acute, with revolute m;irgins, few and divergent ; heads hemispherical, nod- 

 ding, disposed in a virgate raceme ; scales of the involucre scarious, oblong, 

 the outermost lanceolare ; corolla glabrous. — Dougl. ! in herb. Hook. ; DC. 

 prodr. 6. p. 109. A. Ludoviciana, Bess. ! in Hook. I. c, not of Nutt. 



Rocky Mountains towards Arctic America, Richardson! and interior of 

 Oregon near the Spokan and Kettle Falls, Douglas. — Plant 8-12 inches 

 high. Involucre at first tomentose, but at length almost glabrous. — There 

 are two forms ; one (from Richardson ?) with the upper surface of the leaves 

 more tomentose, and more slender lobes ; the other, with the leaves almost 

 glabrous above, and with the lobes shorter and broader. 



17. A. Ludoviciana (Nutt.) : i)erennial, canescently tomentose through- 

 out, branched; leaves lanceolate, mucronate, both surfaces when young 

 clothed with a white tomentum, beneath very densely so ; the lower often 

 incised, remotely and sharply serrate, or sparingly pinnatifid ; the upper en- 

 tire ; heads ovoid, mostly sessile, erect, disposed in a strict leafy panicle ; 

 corolla glabrous. — Nutt.! gen. 2. p. 143 ; DC. prodr. 6. p. 110; Bess. ! in 

 Linnaa, 15. jj. 104. A. integrifolia, Pursh! fi. 2. f. 520. A. Purshiana /3. 

 angustifblia, Bess. ! in Hook. I. c. ; DC. I. c. 



13. latiloha (Nutt.) : lower leaves dilated, deeply pinnatifid, or the upper 

 trifid ; the lobes and the upper leaves broadly lanceolate (pubescence of the 

 upper surface deciduous). — Nutt.! in trans. Amer. jjhil. soc. I. c. p. 400. 



y. gnaphalodes : very tomentose-canescent throughout ; leaves elongated 

 lanceolate, entire, or sharply and irregularly serrate towards the apex. — A. 

 gnaphalodes, Nutt. ! gen. 2. p. 143 ; DC! prodr. 6. p. 115. 



(5. serrata : leaves lanceolate (pretty large), acute or acuminate, sharply 

 but irregularly serrate from the middle to the apex, perfectly glabrous above, 

 at least when old ; heads becoming glabrous ; otherwise exactly as in var. 7. 

 — A. serrata, Nutt. ! gen. 2. p. 142. {herb. Lamb. ! 0^' herb. acad. Philad. !) 



e. latifolia : tomentose-canescent throughout t leaves short, elliptical-lance- 

 olate or somewhat cuneiform-oblong, usually very entire. — A. Purshiana a. 

 latifolia, Bess.! in Hook. jl. Bor.-Am. 1. p. 323 ; Sf in DC. I. c. A. inte- 

 grifolia, Richards, appx. Frankl. journ. ed.2. p. 30. 



Plains and dry banks of rivers, (fee, from the shores of Lakes Huron ! and 

 Michigan! the Saskatchawan ! Missouri ! &c. west to the Rocky Mountains! 

 and south to Texas! 13. Rocky Mountains, Nuttali! Oregon, Dr. Scouler ! 

 (mentioned by Hooker under A. longifolia, Bess, in Hook. fl. Bor.-Am.) 

 y. &^' 6. Upper Great Lakes ! Upper Mississippi ! and Missouri ! e. Plains of 

 the Saskaichawan, Richardson ! Drummond ! Wind River Chain of the 

 Rocky Mountains, Lieut. Fremont ! Aug.-Sept. — Plant 1-5 feet high, some- 

 times simple, variable as to the shape and size of the leaves, but all the forms 

 passing into each other; with small and crowded, rather few-flowered, more 

 or less tomentose heads. The broader leaves are more or less evidently 

 feather- veined. 



18. A. Douglasiana (Bess.) : suflTruticose ? strict, canescent ; leaves ca- 

 nescent beneath ; the cauline lanceolate, acute, entire ; heads spicate-panicu- 

 late, hemispherical ; the panicle somewhat leafy ; scales of the involucre 

 elliptical ; the inner scarious at the apex ; corolla glabrous. Bess, in Hook. 

 I. c, (^ DC. I. c. 



Oregon, Douglas. — Differs from A. integrifolia by its wholly entire leaves, 



