COMPOSITAE. 



[Vol. III. 



19. Artemisia Bigelovii A. Gra}'. 

 Bigelow's Sage-Bush. (Fig. 4016.) 



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

 1856. 



Perennial, shrubby, silvery-cancsceut Ihrough- 

 out, S'-I5' high, much branched, the branches 

 erect. Leaves narrowly cuncate, or oblong, obtuse, 

 truncate, or 3-5-toothed at the apex, S"-9" long, 

 about 1" wide; heads very numerous, about i" 

 broad, densely glomerate-spicate in a narrow vir- 

 gate panicle, 2-5-flo\vered, i or 2 of the marginal 

 ones pistillate, the others perfect and fertile; invo- 

 lucre short-oblong, canescent or tomentose, its 

 bracts oblong, obtuse; receptacle naked. 



Kansas (according to Smyth), and Colorado to Ari- 

 zona. Aug.-Oct. 





20. Artemisia tridentata Nutt. 



Common Sage-bush. Sage-brush. 



Sage-wood. Mountain Sage. 



■:Ac't^ . (^ig- 4017-) 



Arlemisia Iridenlaia Nutt. Trans. Am. Phil. Soc. 

 W /^5^ (II) 7: .598. 1841. 



Shrubby, silvery-canescent; stem much 

 branched, l°-i2°high. Leaves narrowly cune- 

 ate, li'-iyi' long, i"-^" wide, sessile, 3-7- 

 toothed at the truncate apex; heads very nu- 

 merous,5-S-flowered, about lyi" broad, sessile, 

 or very nearly so, in large dense panicles; invo- 

 lucre oblong, tomentose,its inner bracts oblong, 

 ^he outer short, ovate, all obtuse or obtusish; re- 

 •ceptacle 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. 



21. Artemisia cana Pursh. Hoary 

 Sage-Bush. (Fig. 4018.) 



Artemisia cana Pursh, Fl. Am. Sept. 521. 1S14. 



Shrubby, densely white-cancscent; stem 

 much branched, i°-2>2°bigh. Leaves linear, 

 linear-oblong or narrowly lanceolate, sessile, 

 acute at both ends, i'-2' long, i^^'-'-j" wide, 

 usually quite entire, rarely with 2 or 3 acute 

 teeth or lobes; heads numerous, about lYz" 

 broad, glomerate or sometimes solitary in the 

 axils of the leaves, or crowded into a naked 

 thyrsus at the summit, 5-9-flowered; invo- 

 lucre oblong, canescent, its iuner bracts ob- 

 long or lanceolate, obtuse, usually with i- 

 3 shorter outer ones; receptacle naked; 

 flowers all perfect and fertile. 



Plains, Nebraska and Colorado to North Da- 

 kota and the Northwest Territory. July-Sept. 



