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- 

 flowered: 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 incisely toothed lobes; or the upper- 

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

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

 board farther south. I 



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

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

 pniinose, 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 re volute: 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 more 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 A. 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 revplute, the midrib becoming conspicuous below: panicle narrow, 

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

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



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

 rered; 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 re volution 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- 



