Part 3, 1916] CARDUACEAE: ANTHEMIDEAE 253 
1-6 mm. wide, rather soft, long-villous with fine soft hairs, in age glabrous; heads ascending 
or nodding in an open leafy panicle with spreading branches; peduncles slender, 2-3 mm. long; 
involucre hemispheric, scarcely 2 mm. high, fully 2 mm. broad; bracts 10-12, in 3 series, 
glabrous or with a few hairs, the outermost linear-lanceolate, acutish, two thirds to three 
fourths as long as the inner ones; bracts oval, rounded at the apex, broadly scarious-margined, 
thin; ray-flowers about 15; corollas glandular-puberulent, less than 1 mm. long; achenes 0.5 
mm. long; disk-flowers 7-8; corollas deeply campanulate, 1-5 mm. long, glabrous; style tapering 
from the summit. 
TYPE LocaLiry: Sierra Madre, Chihuahua. 
Distripution: New Mexico, Arizona, and Chihuahua. 
7. Artemisia gracillima Rydberg, sp. nov. 
A slender perennial, with branched rootstock; stem about 5 dm. high, finely canescent, 
puberulent when young, in age glabrous, striate, with slender divergent branches; leaves 
linear, 1-4 cm. long, 1-2 mm. wide, spreading or reflexed, finely silky-canescent with short 
appressed hairs, or in age glabrate; heads heterogamous, scattered in open panicles; pe- 
duncles 2-4 mm. long; involucre glabrous or sparingly puberulent, hemispheric, 2 mm. high, 
2-2.5 mm. broad; bracts 12-15, in about 3 series, the outermost lance-linear, acute, not 
scarious, about two thirds as long as the inner ones, the rest scarious-margined and rounded 
at the apex, the innermost broadly oval; ray-flowers 10-12; corollas nearly 1 mm, long; 
achenes 0.7 mm. long; disk-flowers about 10; corollas deeply campanulate, nearly 2 mm. long, 
glabrous; style 1 mm. long. 
Type collected one mile west of Hillsboro, Sierra County, New Mexico, October 2, 1900, Met- 
calfe 1444 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION: Southern New Mexico and Texas. 
8. Artemisia caudata Michx. Fl. Bor. Am. 2: 129. 1803. 
Artemisia variabilis americana Besser, Bull. Soc. Nat. Mose. 8: 24. 1835. 
A biennial; stem 3-10 dm. high, grooved, glabrous, often purplish; basal leaves petioled, 
about 1 cm. long, bipinnatifid into linear divisions, glabrous or somewhat long-hairy when 
young; stem-leaves sessile, pinnatifid into 7-11 linear-filiform divisions about 1 mm. wide; 
heads very numerous, erect or rarely nodding, in a dense leafy panicle, heterogamous; involucre 
hemispheric to campanulate, 3-4 mm. high, 3 mm. broad; bracts glabrous, about 15, in 3-4 
series, scarious-margined, the outer ovate, acute, about half as long as the inner oval acutish 
or obtusish ones; ray-flowers 6-8; corollas 1.5 mm. long; achenes nearly 1 mm. long; disk- 
flowers 10-15; corollas cylindro-campanulate, 2 mm. long, purplish, glabrous, obtuse at the 
base; style 1.5 mm. long, slightly thicker above. 
‘Type LocALIty: Banks of the Missouri River [Missouri?]. 
DISTRIBUTION: New Brunswick and Maine to North meer BevouUne: Texas, and Florida. 
Intustrations: Britt. & Brown, Ill. Fl. f. 3998; ed. 2. f. 4571 
9. Artemisia Forwoodii S. Wats. Proc. Am. Acad. 25: 133. 1890. 
Artemisia desertorum Hookeriana Besser; Hook. Fl. Bor. Am. 1: 325, at least in part. 1833. 
Artemisia commutata Hookeriana Besser, Bull. Soc. Nat. Mosc. 8: 70. 1835. 
Artemisia caudata calvens Lunell, Am. Midl. Nat. 2: 188. 1912. 
A strict biennial, with a taproot; stem 4-7 dm. high, somewhat pubescent when young, 
glabrous in age; basal leaves 5-10 cm. long, petioled, bi- or tri-pinnatifid into narrowly linear 
divisions, loosely silky-canescent at least when young; stem-leaves numerous, often fascicled, 
mostly sessile, pinnatifid into linear-filiform divisions, silky-canescent, or in age glabrate; 
heads numerous in a dense panicle, mostly erect, heterogamous; peduncles 1-2 cm. long; 
involucre subglobose, 2-2.5 mm. high, 2.5-3 mm. broad; bracts 12-15, in 3-4 series, the outer- 
most lanceolate or ovate, acute, half as long as. the innermost ones; innermost bracts oval, 
obtuse or acutish, broadly scarious-margined; ray-flowers 15-20; corollas 1.5 mm. long; achenes 
0.7 mm. long; disk-flowers 10-15; corollas 2 mm. long; style fully 1.5 mm. long. 
Type LocaLity: Black Hills of South Dakota. 
Disreution: Ontario and Michigan to Saskatchewan and Nebraska; Washington. 
