~~ S—-~—~6 sti (Ce 
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ARTEMISIA | COMPOSIT 365 
ers 1-4, with truncate corolla; the hermaphrodite sterile flowers 4-8, their 
corollas ventricose-cainpanulate from a narrow base, 5-toothed: achenes 
oblong-obovate. On alkaline. plains, southeastern Oregon to California 
Wyoming and Idaho. 
* * Perennial herbs without spines: heads many-flowered ; recepta- 
cle hemispherical or ovate: achenes nearly glabrous. 
A. Canadensis Michx. Fl. ii, 129. Glabrous, or mostly with at least the 
radical and sometimes all the leaves either sparsely or canescently silky- 
pubescent: stems 1-2 feet high froma porennia! root: leaves mostly bipin- 
nately divided into linear or almost filiform divisions: heads very numer- 
ous, 1-2 lines long, in a compound oblong or pyramidal virgate panicle: 
involucre greenish, glabrous, or rarely pubescent. On rocky banks and 
plains, Brit. Columbia to California and the Eastern States. 
A. Grenlandica Wormsk. Fl. Dan. t. 1585. Stenssimple, 10-16 inches 
high from a stout perennial caudex: leaves silky-pubescent, radical and 
lower cauline 1-2-ternately or pinnately divided into linear lobes; upper- 
most linear and entire or 3-parted: heads numerous, in a somewhat loose 
narrow thyrsus: involucre pilose or glabrate, pale fuscous or brownish. 
On wet banks, Washington to Alaska and Hudson Bay. 
A. pedatifida Nutt Trans. Am. Phil. Soc. vii, 399. Canescent through- 
out with a fine and close pubescence: cespitose with stout lignescent cau- 
dex, very dwarf: leaves chiefly crowded in radical tufts and on the base of 
the rather naked flowering stems, once or twice 3-parted into narrowly- 
spatulate or nearly linear obtuse entire divisions : heads few, loosely spicate 
or racemosely disposed, canescently pubescent, 12-15-flowered ; the herma- 
phrodite sterile flowers with style barely 2-lobed at summit and no ovary. 
Arid grounds, Idaho and Wyoming to the Rocky Mountains. 
A. dracuncnloides Pursh Fl. ii, 742. Glabrous; stems 2-4 feet high 
from a perennial roqt, virgately or paniculately branched: leaves mostly 
entire, some of the lower ones 3-cleft or more divided, linear, ‘1-4 inches 
long: heads very numerous, in a compound and crowded or open and diff- 
use panicle: involucre nearly hemispheric, its bracts ovate or oblong, green, 
scarious-margined: receptacle hemispheric, naked. Dry plains, British 
Columbia to California Texas and Nebraska. 
§ 2 Evarremisia Gray Syn, Fl. i, pt. 2,369. Heads heterogam- 
ous; the disk-flowers h2rmaphrodite and fertile, with 2-cleft style. 
* Achenes obovoid or oblong, wholly destitute of pappus: receptacle 
beset with long woolly hairs. 
A. frigida Willd. Sp. iii, 1838. Silky-canescent and silvery: herbace- 
ous froma suffrutescent base, about a foot high; simple or branching, 
numerous racemously disposed heads in an open Sinter's On leayes mainly 
twice ternately or quinately divided or parted into linear crowded lobes, 
and usually a pair of simple or 3-parted stipuliform divisions at the base 
of the petiole: heads globular, barely 2 lines in diameter; involucre pale, 
canescent, its bracts narrow and herbaceous: corollas glabrous. Idaho to 
Nevada Texas Minnesota and the Saskatchewan. 
* * Achenes obovoid or oblong, with small epigynous disk, wholly 
destitute of pappus: receptacle not villous. 
A. biennis Willd. Phytogr. 1794, 11. Annual or biennial: wholly glab- 
rous and inodorous: stems strict 1-4 feet high, with nearly erect branches, 
very leafy, bearing close glomerules of small heads in the axils from near 
the base of the somewhat naked and spiciform summit: leaves 1-3 inches 
long, 1-2-pinnately parted into lanceolate or broadly linear laciniate or 
incisely toothed lobes; or the uppermost small, sparingly pinnatifid and 
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