COMPOSITAE. 



VOL. 111. 



21. Artemisia Bigelovii A. Gray. Bigelow's 

 Sage-Bush. Fig. 4591. 



Artemisia Bigelovii A. Gray, Pac. R. R. Rep. 4: no. 

 1856. 



Perennial, shrubby, silvery-canescent throughout, 

 8'-is' high, much branched, the branches erect. Leaves 

 narrowly cuneate, or oblong, obtuse, truncate, or 

 3-5-toothed at the apex, 5"-$" long, about i" wide; 

 heads very numerous, about i" broad, densely glom- 

 erate-spicate in a narrow virgate panicle, 2-5-flow- 

 ered, i or 2 of the marginal ones pistillate, the others 

 perfect and fertile; involucre short-oblong, canescent 

 or tomentose, its bracts obtuse; receptacle naked. 



Kansas (according to Smyth) ; Colorado to Texas and 

 Arizona. Aug.-Oct. 



22. Artemisia tridentata Nutt. Common 



Sage-bush. Sage-brush. Sage-wood. 



Mountain Sage. Fig. 4592. 



Artemisia tridentata Nutt. Trans. Am. Phil. Soc. 



(II) T. 398. 1841. 



Shrubby, silvery-canescent ; stem much branch- 

 ed, I-I2 high. Leaves narrowly cuneate, \'- 

 li' long, i "-3" wide, sessile, 3-7-toothed at the 

 truncate apex ; heads very numerous, 5-8-flow- 

 ered, about li" broad, sessile, or very nearly so, 

 in large dense panicles; involucre oblong, to- 

 mentose, its inner bracts oblong, the outer short, 

 ovate, all obtuse or obtusish ; receptacle naked ; 

 flowers all perfect and fertile. 



On dry plains and in rocky soil, western Ne- 

 braska to Colorado, Utah and California, north to 

 Montana and British Columbia. July-Sept. 



23. Artemisia cana Pursh. Hoary Sage- 

 bush. Fig. 4593. 



Artemisia cana Pursh, Fl. Am. Sept. 521. 1814. 



Shrubby, densely white-canescent ; stern much 

 branched, i-2$ high. Leaves linear, linear- 

 oblong or narrowly lanceolate, sessile, acute 

 at both ends, i'-2 r long, ii"-3" wide, usually 

 quite entire, rarely with 2 or 3 acute teeth or 

 lobes ; heads numerous, about li" broad, glom- 

 erate or sometimes solitary in the axils of 

 the leaves, or crowded into a naked thyrsus 

 at the summit, 5-9-flowered ; involucre ob- 

 long, canescent, its inner bracts oblong or lan- 

 ceolate, obtuse, usually with 1-3 shorter outer 

 ones ; receptacle naked ; flowers all perfect and 

 fertile. 



Plains, Nebraska and Colorado to North Da- 

 kota, Montana and Saskatchewan. July-Sept. 



95. TUSSILAGO [Tourn.] L. Sp. PI. 865. 1753. 



An acaulescent herb, more or less white-tomentose, with slender perennial rootstocks, 

 broad basal cordate, dentate or lobed, long-petioled leaves, and large solitary, monoecious 



