736 



CONTRIBUTIONS FEOM THE NATIONAL HEEBAEIUM. 



Herbs, at most woody only at the base; leaves 

 various, more or less tomentose. 

 Involucres glabrous, at least in age; lower 



leaves bipinnate 16. A.franserioides. 



Involucres densely tomentose, at least 



when young; lower leaves toothed 



or pinnatifid. 



Lower leaves merely coarsely toothed 



or lobed, the teeth or lobes short, 



the upper leaves entire; plants 



permanently wliite - tomentose 



throughout. 



Leaves glabrous or glabrate on the 



upper surface 17. A. sihicola. 



Leaves permanently tomentose on 

 the upper surface. 

 Panicles strict; plants stout, strict; 



heads 3 to 4 mm. wide .'18. A. rhizomata. 



Panicles lax, spreading; plants 

 slender, much branched 

 above; heads about 2 mm. 



wide 19. A. albula. 



At least the lower leaves pinnatifid 



with long, filiform to lanceolate 



segments; pubescence various. 



Divisions of the leaves filiform; 



variously pubescent. 



Leaves permanently white-to- 



mentose 20. A. hansana. 



Leaves glabrate above in age 21. A. wrightii. 



Divisions of the leaves broader, 



oblong - linear to lanceolate, 



never fiUform, glabrate above. 



All leaves divided, the segments 



narrowly oblong-linear 22. A. redolens. 



Upper leaves lanceolate, undi- 

 vided, the segments of the 

 lower leaves oblong-lanceo- 

 late 23. A. viexicana. 



1. Artemisia biennis Willd. Sp. PI. 3: 1842. 1804. 

 Type locality: "Nova Zelandia?" 



Range: British America to CaUfomia, New Mexico, and Pennsylvania. 

 New Mexico: Shiprock; Dulce; Castle Rock. Wet ground, in the Upper Sonoran 

 and Transition zones. 



2. Artemisia caudata Michx. Fl. Bor. Amer. 2: 129. 1803. 

 Type locality: "Hab. ad ripas sabulosas fluminis Missouri." 



Range: Manitoba and Vermont to New Mexico, Texas, and the Atlantic coast. 

 New Mexico: Nara Visa (Fisher 174). Upper Sonoran Zone. 



3. Artemisia cana Pursh, Fl. Amer. Sept. 521. 1814. 

 Type locality: "On the Missouri." 



Range: Rocky Mountain Region, south to northern New Mexico. 

 New Mexico: Dulce {Standley 8082). Plains and valleys, in the Upper Sonoran 

 and Transition zones. 



