282 NORTH AMERICAN FLORA [VoLumE 34 
XVIII. Tridentatae. Shrubsor undershrubs. Leaves canescent, entire or 3—5-toothed or 
3—5-cleft at the apex. Heads more or less paniculate; involucre more distinctly imbricate. 
Style included or slightly exserted. 
107.. Artemisia Bolanderi A. Gray, Proc. Am. Acad. 19: 50. 1883. 
Artemisia trifida A. Gray, Bot. Calif. 1: 405, in part. 1876. 
A low shrub, 3-6 dm. high; branches loosely villous-tomentose; leaves linear, loosely 
tomentose, 2-3 cm. long, 1-2 mm. wide, acute, entire or the earlier slightly 3-lobed at the 
apex; heads in dense leafy panicles; involucre campanulate, about 3 mm. high and nearly 
as broad, densely tomentose; bracts 12-15, oblong, obtuse; flowers about 14; corollas about 
2 mm. long, with a glandular-granuliferous tube; style included; achenes 1.5 mm. long. 
‘TYPE LOCALITY: Mona Pass in the Sierra Nevada, California. 
DISTRIBUTION: Type locality and vicinity. 
108. Artemisia cana Pursh, Fl. Am. Sept. 521. 1814. 
Artemisia columbiensis Nutt. Trans. Am. Phil. Soc. IT. 7: 398. 1841. 
Artemisia cana viscidula Osterhout, Bull. Torrey Club 27: 507. 1900. 
Artemisia viscidula Rydb. Bull. Torrey Club 33: 157. 1906. 
A low shrub, 3-10 dm. high, with yellowish or greenish bark; leaves linear or oblong- 
linear, acute, 2-5 cm. long, 2-4 mm. wide, silky-canescent, or sometimes glabrate in age and 
subviscid; heads conglomerate in a dense leafy panicle; involucre campanulate, 5 mm. high, 
3-4 mm. broad; bracts about 12, imbricate in 3 series, the outer thick, canescent, one or two 
often with an acuminate foliaceous tip, the inner elliptic, scarious; flowers 5-15; corollas about 
3 mm. long, with a cylindric glandular-granuliferous tube, equaling the cylindro-campanulate 
throat; style included; achenes ellipsoid, 2 mm. long. 
TYPE LocALITy: On the Missouri. 
DIsTRIBUTION: Saskatchewan and Alberta to Nebraska, Colorado, Utah, and Oregon. 
ILLUSTRATIONS: Britt. & Brown, Ill. Fl. f. 4018; ed. 2. f. 4593. 
109. Artemisia Rothrockii A. Gray, Bot. Calif. 1: 618. 1876. 
Artemisia trifida A. Gray, Bot. Calif. 1: 405, in part. 1876. 
A low shrub, 2-4 dm. high; bark light-brown; leaves mostly narrowly cuneate and 3-4- 
cleft into oblong lobes, and some of them entire and oblong, 1—2 cm. long, sparingly and finely 
cinereously canescent, often glabrate, more or less viscid; heads rather few in an interrupted 
spike-like inflorescence, 1—3 short-peduncled or subsessile at each internode; involucre hemi- 
spheric-campanulate, about 4 mm. high, 4-5 mm. broad; bracts 10-12, imbricate in 3-4 series, 
brown, shining, one of the outer bracts often a little foliaceous, abruptly acuminate, the rest 
ovate, acute, half as long as the innermost; inner bracts elliptic, obtuse, scarious; flowers 10-12; 
corollas trumpet-shaped, 3 mm. long, 5-toothed, sparingly glandular-granuliferous; style 
slightly exserted; achenes nearly 2 mm. long. 
TYPE Locality: Sierras of Tulare County, California. 
DISTRIBUTION: Sierra Nevada, California and Nevada. 
110. Artemisia arbuscula Nutt. Trans. Am. Phil. Soc. II. 7: 398. 
1841. 
A low shrub, 1-3 dm. high, with stout, often decumbent base and slender branches; leaves 
short, 1-2 cm. long, canescent, cuneate or flabellate in outline, 3—5-lobed or 3—5-parted at the 
apex, with spatulate to linear divisions, or those of the inflorescence often entire; heads several 
in a strict simple racemiform panicle; involucre campanulate, 4-5 mm. high, 3-4 mm. broad; 
bracts about 10, the outer lanceolate, acute, somewhat herbaceous, half as long as the inner- 
most; inner bracts oblong, obtuse, scarious with green midrib; flowers 7—9; corollas trumpet- 
shaped, sparingly glandular-granuliferous, 3 mm. long; style included; achenes nearly 2 mm. 
long. 
TyPE Locatity: Arid plains of Lewis River [Snake River]. 
DISTRIBUTION: Wyoming to Oregon and central California. 
