568 coMPOsiTAE (composite family) 



divisions 3-parted into spatulate-linear lobes; the uppermost simply 3-5-parted 

 or entire: involucre 4 mm. broad, villous, the bracts brown-margined: corollas 

 hirsute at summit. — ^Alpine region; mountains of Colorado, Utah, and Wyo- 

 ming. 



9. Artemisia Pattersonii Gray, Syn.Fl. 1: 453. 1886. More dwarf and 

 white-tomentose, but sometimes glabrate in age: leaves 3-5-parted or cleft, or 

 the uppermost entire : heads much larger and broader, solitary or 2-5, 40-50- 

 fiowered: corollas glabrous: receptacle extremely loose-woolly. — Lower alpine 

 region of the Rocky Mountains in Colorado. 



10. Artemisia biennis Willd. 1. c. 1842. Wholly glabrous, inodorous and 

 nearly insipid; stem strict, 3-12 dm. high, leafy to the top, bearing close 

 glomerules of small heads in the axils from toward the base of the stem to the 

 somewhat naked and spiciform summit: leaves 1-2-pinnately parted into 

 lanceolate or broadly linear-laciniate or inoisely toothed lobes; or the upper- 

 most small, sparingly pinnatifid and less toothed. — Open grotmds from Cali- 

 fornia and Oregon to Hudson's Bay; also now spreading to the eastern sea- 

 board farther south. 



11. Artemisia subglabra A. Nels. 1. c. 27: 36. Stems rather few, erect, 

 ascending, slender, more or less branched above, very obscurely glandular- 

 pruinose, otherwise green and glabrous as are also the leaves, 3-5 dm. high: 

 leaves pinnate or bipinnate; the segments linear or sometimes broader, 

 widely divaricate, the margins more or less revolute: inflorescence racemiform 

 or narrowly paniculate; heads medium size (3-5 mm.), shortly pediceled, 

 spreading or deflexed; involucral bracts green, oblong, with ciliate-lanate 

 margins: flowers 12-20, all fertile, the pistillate with flattened or grooved 

 spatulate styles. — On the stony banks of the Yellowstone river in the National 

 Park. 



12. Artemisia saxicola Rydb. Bull. Torr. Bot. Club 32: 128. 1905. Rather 

 stout, 1-5 dm. high, from villous or pubescent to glabrate: leaves twice 3-7- 

 parted into linear or lanceolate or raore dilated segments: heads 8-10 mm. 

 broad, many-flowered, loosely racemose or racemose-paniculate, most of them 

 long-peduncled; bracts of the involucre broadly brown-margined: corollas 

 loosely pilose, rarely almost glabrous. A. norvegica; true j4.. norvegica does 

 not occur on this continent. — High mountains of our range and northward. 



12a. Artemisia saxicola Parryi A. Nels. Smaller than the species in all of 

 its parts, with a tendency to become glabrate. (A. Parryi Gray, Proc. Am. 

 Acad. 7: 361. 1868.) — Type locality only, Sangre de Cristo Pass, Colorado. 



13. Artemisia natronensis A. Nels. Bull. Torr. Bot. Club 26: 485. 1899. 

 Stems herbaceous, from a woody, persistent crown, suberect, simple, virgate, 

 silvery-white-tomentose as are also the leaves, floriferous for nearly half their 

 length, 3-6 dm. high: leaves long-linear to narrowly lanceolate, in age the 

 margins revolute, the midrib becoming conspicuous below: panicle narrow, 

 the raceme-like clusters in the axils of the leaves which become gradually 

 smaller and bract-Uke upward or wholly wanting; heads rather large, cam- 

 panulate,- about 5 mm. high, erect or nearly so even at maturity, about 20- 

 flowered; the bracts ovate to' oval. — On the strongly saline shores of alkali 

 lakes; Wyoming and Colorado. ; 



14. Artemisia Wrightii Gray, Proc. Am. Acad. 19: 48. 1883. Cinereous, 

 canescent, or glabrate, the radical shoots sometimes white-tomentose, 2-5 dm. 

 high, very leafy up to the rather narrow dense panicle: leaves pinnately 5-7- 

 parted into narrow, linear and by revolution filiform, entire divisions : involucre 

 cinereous-canescent (sometimes woolly), becoming glabrate; heads small, 

 sessile or short-peduncled, often spreading. (A. kansana Brit, in Brit. & 

 Brown, 111. Fl. 3: 466. 1898, more white-woolly than the type; A, stenoloba 

 Rydb.) — From Kansas to Colorado and southward. 



14a. Artemisia Wrightii coloradensis (Osterh.) A. Nels. To be distin- 

 guished mainly by the coarser leaves and their broader segments. (A. colo- 

 radensis Osterh. Bull. Torr. Bot. Club 27: 506. 1900.)— Represents the 

 northern extension of the species in Colorado. 



15. Artemisia gnaphalodes Nutt. Gen. 2: 143. 1818. Stems white- 



