A. VULGARIS. 77 



mostly cleft into few divergent linear-lanceolate acute lobes, sometimes mostly entire 

 or only dentate, the uppermost entire, all gray and loosely floccose or green and nearly 

 glabrous above, white-tomentose beneath (see note under citation of type specimen); 

 inflorescence an elongated narrow compact panicle, 1.5 to 3 cm. broad or sometimes 

 leafy, more branched, and then up to 10 cm. broad; involucre campanulate, about 3 mm. 

 high, 2.5 to 3 mm. broad, more or less tomentose (green and nearly glabrous in form known 

 as A. potens), 12- to 20-flowered. {A. ludoviciana Nuttall, Genera 2:143, 1818.) Abun- 

 dant and widely distributed in western North America: Montana, and perhaps farther 

 north, to Wisconsin, Kansas, Texas, Chihuahua, California, Washington, and Idaho; 

 introduced in New England (Collins, Rhodora 1 :47, 1899; Fernald and Wiegand, Rhodora 

 12:144, 1910). Type locality, on the banks of the Mississippi River near St. Louis. 

 Collections (mostly with leaves much greener above than in the type) : Wild Horse 

 Island, Montana, Butler 469 (NY); Fort Howard, Wisconsin, September 15, 1878, 

 Schuette (UC, intermediate to subspecies gnaphalodes) ; Woods Creek, Wyoming, Nelson 

 8O45 (UC); Mclntyre Creek, Larimer County, Colorado, Osterhout 2242 (Osterhout 

 Hb, R, NY, type collection of A. silvicola Osterhout, minor variation 76); Idaho Springs, 

 Colorado, Shear 4617 (NY, type of A. cuneata Rydberg, minor variation 10) ; near Ouray, 

 Colorado, Underwood and Selhy 74 (NY, type of A. underwoodi Rydberg, minor variation 

 88); Riley County, Kansas, Norton 300 (NY) ; Courtney, Missouri, Bush 6509 (Gr, NY); 

 type collection, "St. Louis," Nuttall (Phila., leaves more tomentose above than in most 

 specimens here cited, but the tomentum much less dense than on the under surface 

 where it is closely felted and white) ; Ottawa, Oklahoma, Stevens 2500 (Gr) ; Weatherford, 

 Texas, Tracy 8135 (NY); near Colonia Garcia, Chihuahua, Townsend and Barber 326 

 (NY); Cananea, Sonora, Donnelley 44 (UC); near Pecos, San Miguel County, New 

 Mexico, Standley 51 IS (NY); Fort Lowell, Arizona, Thornber 50 (UC, NY); Bear Valley, 

 San Bernardino Mountains, California, Abrams 2823 (Gr, NY); trail to Mount Whitney, 

 California, Culbertson 4^41 (NY, minor variation 62, A. potens Nelson); Charleston 

 Mountains, Nevada, Heller 11086 (NY, same variation); Marysvale, Utah, Jones 5846 

 (UC, NY); Columbia River, Washington, Suksdorf 1610 (UC). 



llj. Artemisia vulgaris gnaphalodes (Nuttall). — Stems erect, 3 to 10 dm. high, 

 from creeping rootstocks; lower leaves oblanceolate or somewhat cuneate to linear, 

 entire or often with a few teeth or even pinnately cleft into lanceolate lobes; principal 

 leaves linear to broadly elliptic in outline, 3 to 10 cm. long, 0.5 to 3 cm. wide, mostly 

 entire in the typical form but varying to dentate, cleft, or even divided into several 

 linear-lanceolate acute ascending lobes, those of the inflorescence chiefly entire and 

 narrow, all leaves densely permanently and equally white-tomentose on both sides, 

 the margins essentially plane (connects with subspecies longifolia through forms with 

 leaves entire and broad but glabrate and through others with leaves narrow but per- 

 manently tomentose, while the form with prominent short and broad leaf-lobes is A. 

 britloni Rydberg, minor variation 6) ; inflorescence an elongated panicle, dense, 2 to 5 

 cm. broad; involucre campanulate, 3 to 3.5 mm. high, about 3 mm. broad, densely tomen- 

 tose, 15- to 30-flowered (lower counts probably due to the falling out of some of the 

 flowers). {A. gnaphalodes Nuttall, Genera 2:143, 1818.) Ontario and Michigan to 

 Missouri, Texas, Coahuila, California, British Columbia, and Saskatchewan; introduced 

 in Pennsylvania and along the Atlantic Coast from Quebec to Massachusetts. Type 

 locality, dry savannahs about Green Bay, Lake Michigan. Collections: Newbury, 

 Massachusetts, introduced, August 7, 1899, WilUams (Gr); Point Edward, Lake Huron, 

 Ontario, Macoun 2635 (NY, US); Lake Mendota, Madison, Wisconsin, August 24, 1893, 

 Sudworih (NY, US); Oregon, Ogle County, Illinois, September 2, 1886, Watte (US); 

 Moscow, Iowa, Somes 3707 (US); near Thedford, central Nebraska, Rydberg 1725 (Gr, 

 US); Black Hills Forest, South Dakota, Murdoch 4305 (Gr); Centennial, Wyoming, 



