5 2 4 



COMPOSITAE. 



VOL. III. 



3. Artemisia canadensis Michx. Canada Worm- 

 wood. Fig. 4573. 



Artemisia canadensis Michx. Fl. Bor. Am. 2: 129. 1803. 



Root perennial (or sometimes biennial) ; stem pubes- 

 cent or glabrous, strict, simple or branched, i-2 high, 

 the branches appressed and erect. Leaves usually pubes- 

 cent, but sometimes sparingly so, the basal and lower ones 

 petioled, 2'-$' long, 2-pinnately divided into linear, acute 

 lobes which are shorter and broader than those of Arte- 

 misia caudata; upper leaves sessile, less divided ; heads 

 short-peduncled, about 2" broad, commonly numerous in 

 a narrow virgate panicle, mostly spreading or erect, in 

 small forms the panicle reduced to a nearly or quite sim- 

 ple terminal raceme; involucre ovoid, its bracts ovate or 

 oval, green, glabrous or pubescent;. receptacle hemispheric; 

 central flowers sterile. 



In rocky soil, Newfoundland to Hudson Bay, Maine, Ver- 

 mont, west along the Great Lakes to Minnesota and Manitoba 

 and to the Canadian Pacific coast. Sea- or wild-wormwood. 

 July-Aug. 



Artemisia Forwoodii S. Wats., a taller plant of the Rocky 

 Mountain region, with somewhat smaller heads, ranges east- 

 ward into Nebraska. 



4. Artemisia dracunculoides Pursh. Linear- 

 leaved Wormwood. Fig. 4574- 



A. dracunculoides Pursh, Fl. Am. Sept. 742. 1814. 



Perennial, glabrous ; stem somewhat woody, usu- 

 ally much branched, 2-4 high, the^ branches nearly 

 erect. Leaves linear, i'-3^' long, i"-2" wide, acute, 

 entire, or the lower and basal ones sometimes 3-clef t 

 or even more divided; heads very numerous, i"-ii" 

 broad, nodding, very short-peduncled, racemose- 

 paniculate ; involucre nearly hemispheric, its bracts 

 ovate or oblong, green, scarious-margined ; recep- 

 tacle hemispheric, naked ; central flowers sterile. 



Dry plains and prairies, Manitoba to British Colum- 

 bia, Illinois, Missouri, Nebraska, Texas, Chihuahua, 

 New Mexico and California. July-Nov. 



5. Artemisia glauca Pall. Silky Worm- 

 wood. Fig. 4575. 



A. glauca Pall.; Willd. Sp .PI. 3: 1831. 1804. 

 Artemisia dracunculoides var. incana T. & G. Fl. N. 

 A. 2 : 416. 1843. 



Perennial, similar to the preceding species; 

 stems strict, leafy, usually simple or little branch- 

 ed, i-2 high, pubescent, tomentose or canescent, 

 or glabrous below. Leaves linear, \'-2.\' long, 

 about i" wide, entire, finely and densely pubes- 

 cent, obtuse or obtusish, or the lower or some- 

 times nearly all of them 3-cleft into linear lobes, 

 i'-ii' long; panicle narrow, branched, its branches 

 nearly erect; heads drooping, sessile, very numer- 

 ous, scarcely more than li" long; involucre hemi- 

 spheric, its bracts scarious-margined. obtuse; re- 

 ceptacle naked ; central flowers sterile. 



Minnesota to North Dakota, Manitoba and Sas- 

 katchewan. June-Sept. 



