284 NORTH AMERICAN FLORA [VoLUME 34 
115. Artemisia nova A. Nelson, Bull. Torrey Club 27: 274. 1900. 
Artemisia arbuscula Nutt. Trans. Am. Phil. Soc. II. 7: 398, in part. 1841. 
A low shrub, 1-3 dm. high, with numerous branches decumbent or spreading at the base; 
bark grayish, shreddy; leaves canescent, narrowly cuneate, 1-2 cm. long, 3-toothed at the 
apex; heads many in a strict, narrow, leafy panicle; involucre campanulate, 3-3.5 mm. high, 
about 2 mm. broad, slightly puberulent and somewhat viscid; bracts 12-15, the outer ovate, 
one fourth as long as the innermost, thick; inner bracts oblong, obtuse, thin, scarious-margined; 
flowers 1-6; corolla trumpet-shaped, glandular-granuliferous, 2.5 mm. long; style equaling 
the corolla; achenes about 1.5 mm. long. 
TYPE LOCALITY: Medicine Bow, Wyoming. 
DISTRIBUTION: Wyoming and Idaho to New Mexico and Arizona. 
116. Artemisia tripartita Rydb. Mem. N. Y. Bot. Gard. 1: 432. 
1900. 
Artemisia trifida Nutt. Trans. Am. Phil. Soc. II. 7: 398. 1841. Not A. trifida Turez. 1832. 
A low shrub, 2-6 dm. high, much branched; bark grayish; leaves canescent, 1-4 cm. 
long, deeply 3-cleft into linear or narrowly linear-oblanceolate divisions, or the upper entire 
and linear; heads numerous in narrow leafy panicles; involucre campanulate, about 3.5 mm. 
high and 2 mm. broad, canescent; bracts 12-15, the outer ovate, thick, fully one third as long 
as the innermost; inner bracts oblong, scarious; flowers 6-8; corollas trumpet-shaped, 2 mm. 
long, sparingly glandular-granuliferous; style not exserted; achenes 1.5 mm. long. 
TYPE LocaLity: Plains of the Rocky Mountains. 
DIsTRIBUTION: Montana to Colorado, Nevada, Oregon, and Washington. 
117. Artemisia Parishii A. Gray, Proc. Am. Acad. 17: 220. 1882. 
A shrub, 8-12 dm. high; bark straw-colored or grayish; leaves canescent, 2-3 cm. long, 
linear and entire or some dilated at the apex and 3-toothed; heads numerous in a lax panicle 
with the branches more or less nodding at the apex; involucre turbinate, 3.5-4 mm. high, 3 mm. 
broad; bracts 12-15, in 3 series, the outer thick, ovate, about one third as long as the inner- 
most; inner bracts elliptic, obtuse, thinner and scarious-margined; flowers 6 or 7; corollas 2 mm. 
long, with a short glandular-granuliferous tube and glabrous campanulate throat; style short- 
exserted; achenes 1.5 mm. long, sparingly arachnoid-hairy. 
TYPE Locality: Newhall, Los Angeles County, California. 
DISTRIBUTION: Southern California. 
XIX. Rigidae. Low shrubs. Leaves silvery-canescent, pinnatifid into narrow revolute 
divisions. Heads solitary or few together in the leaf-axils, Involucre imbricate. Style 
included. 
118. Artemisia rigida (Nutt.) A. Gray, Proc. Am. Acad. 19: 49. 
1883. 
Artemisia trifida rigida Nutt. Trans. Am. Phil. Soc. II. 7: 398. 1841. 
A low shrub, with woody base and erect branches, 1-4 dm. high, leafy to the top; leaves 
silvery-canescent, 2-4 cm. long, pinnatifid into 3—5 linear filiform, revolute-margined divisions, 
or some of them linear and entire; heads.solitary or in small glomerules in the axils of the 
leaves; involucre campanulate, 4mm. high and 3 mm. broad; bracts about 15, canescent, in 
3 or 4 series, the outer lanceolate, acute, less than one half as long as the innermost; inner 
bracts linear-oblong, obtuse; flowers 5-12; corollas narrowly funnelform, glandular-granu- 
liferous; style mostly included; achenes 1.5 mm. long, glabrous. 
TYPE LocaLity: Plains of Lewis River [Snake River, Idaho]. 
DISTRIBUTION: Oregon, Washington, and western Idaho. 
XX. Pygmaeae. Lowundershrub. Leaves pinnatifid into 3-7 narrow segments, strongly 
ribbed beneath, rigid, glabrous or slightly canescent beneath. Heads few, spicate. Style 
included. 
