COMPOSITAE (COMPOSITE FAMILY) 567 



2. Artemisia aromatica A. Nels. Bull. Torr. Bot. Club 27: 273. 1900. 

 Dark green and nearly or quite glabrous, heavily but rather pleasantly 

 aromatic scented; stems tufted, mostly simple, sometimes sparingly branched 

 from the base, more or less branched in the inflorescence, striate, 4-8 dm. 

 high: leaves nearly all entire, some of the lower 3-cleft, narrowly to broadly 

 linear, 1-several cm. long, numerous: inflorescence leafy; the heads numerous, 

 nodding on short slender pedicels, 3-4 mm. in diameter; involucre glabrous^ 

 the bracts oblong-elliptic, obtuse, dark green with scarious margins: flowers 

 numerous, the fertile 10-20, the sterile hermaphrodite about twice as many. 

 A. dracunculoides* Mountain valleys and on the plains; frequent throughout 

 our range and westward. 



3. Artemisia canadensis Michx. Fl. Bor. Am. Sept. 2: 129. 1803. Gla- 

 brous, or mostly with at least the radical and sometimes all the leaves either 

 sparsely or canescently silky-pubescent; stems 3-6 dm. high from a perennial 

 root: leaves mostly bipinnately divided into linear or almost filiform divisions: 

 heads very numerous, 2-4 mm. long, in a compound, oblong or pyramidal, 

 virgate panicle; involucre greenish, glabrous, or rarely pubescent. [A. 

 Scouleriana (Besser) Rydb. Bull. Torr. Bot. Club 33: 157. 1906; A. Forwoodii 

 Wats. Proc. Am. Acad. 25: 133. 1890.] Throughout the northern part of the 

 United States and in the Canadian provinces, and southward in the Rocky 

 Mountains. 



4. Artemisia pedatifida Nutt. 1. c. 399. Caespitose, with a stout lignescent 

 caudex, very dwarf, canescent throughout with a fine and close pubescence: 

 leaves chiefly crowded in radical tufts and on the base of the (3-6 cm. high) 

 rather naked flowering stems, once or twice 3-parted into narrowly spatulate 

 or nearly linear-obtuse entire divisions: heads (about 3 mm. broad) few, 

 loosely spicately or racemosely disposed, canescently pubescent. Dry ground; 

 on the plains of Wyoming, Montana, and Idaho. 



5. Artemisia borealis Pall. Iter. 3: 129. 1871. Stems 1-3 dm. high, 

 from a stout caudex; stems simple: leaves silky-pubescent or silky-villous; 

 radical and lower 1-2-ternately or pinnately divided into linear lobes; the up- 

 permost linear and entire or 3-parted: heads 4 mm. broad, comparatively few, 

 crowded in a narrow (rarely compound) spiciform thyrsus with leaves inter- 

 spersed ; involucre pilose or glabrate, pale fuscous to brownish. (A . spithamaea 

 Pursh, Fl. 2: 522. 1814.) In the alpine region of Colorado, and far north- 

 ward across the continent. 



6. Artemisia filifolia Torr. Ann. Lye. N. Y. 2: 211. 1828. Stem branched, 

 3-6 dm. high, the rigid branches nearly erect: leaves 2-5 cm. long, nearly all 

 3-parted into filiform entire segments less than 1 mm. wide, or the uppermost 

 undivided: heads exceedingly numerous, about 1 mm. broad, racemose- 

 paniculate, very short-peduncled, 3-5-flowered; involucre oblong, the bracts 

 densely canescent: receptacle small, naked or slightly fimbrillate: central 

 1-3 flowers sterile. Dry plains; eastern Wyoming and adjacent Nebraska to 

 Texas, Utah, and Mexico. 



7. Artemisia frigida Willd. Sp. PL 3: 1838. 1804. Herbaceous from a 

 suffrutescent base, silky-canescent and silvery, 2-3 dm. high; stems simple or 

 branching, bearing numerous racemosely disposed heads in an open panicle: 

 leaves mainly twice ternately or quinately divided or parted into linear, 

 crowded lobes, and usually a pair of simple or 3-parted stipuliform divisions 

 at base of the petiole: heads globular, 3-4 mm. in diameter; involucre pale, 

 canescent, the outer bracts narrow and herbaceous: corollas glabrous. From 

 Minnesota to Texas and westward to New Mexico, Nevada, and Idaho. 



8. Artemisia scopulorum Gray, Proc. Acad. Phila. 66. 1863. Herbaceous, 

 1-2 dm. high, from a multiciDital caudex, silky-canescent; stems simple, bear- 

 ing 3-12 spicately or racemosely disposed hemispherical (rarely solitary) 

 heads: radical and few lower cauline leaves pinnately 5-7-clivided, and the 



* Artemisia dracunculoides Pursh is often reported from our range. That species is paler 

 green, much taller, with numerous drooping branches and smaller heads of only 15-20 

 flowers; inodorous or at least not sweet-aromatic. Doubtfully in our range, the typical form 

 of it in the central and lower Mississippi valley. 



