CARDUACEAE. 385 



Heads about 5 mm. wide ; outer bracts only tomentose ; inflorescence raceme- 



or spike-like. 37. A. spiciformis. 



Leaves all linear, entire, acute, or rarely a few of them 3-cleft at the apex; 



heads 3-4 mm. wide in a compact inflorescence. 

 Leaves permanently canescent, not viscid. 38. A. cana. 



Leaves, at least in age, glabrate, more or less viscid. 39. A. viscidula. 



1. Artemisia aromatica A. Nels. In mountain valleys from Alb. and Wash, 

 to Colo. Alt. up to 9000 ft. Breckenridge ; Ironton Park, nine miles south 

 of Ouray. 



2. Artemisia dracunculoides Pursh. On prairies and plains from Mont, and 

 Ida. to Tex. and Calif. Alt. 5000-8000 ft. Below Hot Sulphur Springs; 

 Middle Park ; Ft. Collins ; lola ; Huerfano Valley, near Gardner ; Table Rock ; 

 Elk River; Democrat Mountain. 



Artemisia dracunculoides Wolfii Rydb. Heads larger with lanceolate bracts. 

 In mountain valleys of Wyo. and Colo. Alt. 7000-9000 ft. Hamor's Lake, 

 north of Durango; Grizzly Creek; Honnold; Twin Lakes; Colorado Springs. 



3. Artemisia glauca Pall. On plains from Man. and Ass. to Nebr. and 

 Colo. Golden. 



4. Artemisia Scouleriana (Besser) Rydb. (A. desertorum Scouleriana 

 Besser) In valleys from B. C. to Colo. Alt. 5000-10,000 ft. New Windsor; 

 Ruxton Dell ; Denver. 



5. Artemisia Forwoodii S. Wats. (A. desertorum Besser, in part; A. Cana- 

 densis A. Gray, in part; not Michx.) On plains and hills from Ass. and 

 Mont, to N. M. Alt. 5000-7500 ft. lola; Mt. Harvard; Baxter's ranch; 

 Redstone; foot-hills, Larimer Co.; Boulder; Pine Grove; Ft. Collins; Cipango 

 Hill ; Lake City ; Cheyenne Mountain ; South Park. 



6. Artemisia spithamaea Pursh. (A. borealis A. Gray, in part; not Pall) 

 On alpine peaks and in arctic regions from Lab. to Alaska and Colo. Alt. 

 11,000-12,500 ft. Cameron Pass; Gray's Peak; mountains about the head- 

 waters of Clear Creek ; Cumberland Mine, La Plata Mountains ; Berthoud 

 Pass ; near Empire. 



7. Artemisia filifolia Torr. On plains from Neb. and Wyo. to Tex. and 

 Ariz.; also Mex. Alt. 4000-5500 ft. Cheyenne Wells; New Windsor; near 

 Denver; near Timnath; plains of the Platte. 



8. Artemisia frigida Willd. On dry hills from Hudson Bay to Alaska, Tex, 

 and Utah. Alt. 4000-10,000 ft. Chambers' Lake ; Pagosa Springs ; Boulder ; 

 Graymont ; Bosworth's ranch, Stove Prairie ; lola ; Mt. Harvard ; Cucharas 

 Valley, near La Veta; Denver; Colorado Springs; mountains of Larimer Co.; 

 dry hills, Lake John, North Park; Manitou ; Gunnison; Twin Lakes; Middle 

 Park; Ft. Collins; Golden; Lake City. 



9. Artemisia scopulorum A. Gray. On high mountain peaks from Wyo. to 

 Colo, and Utah. Alt. 11,000-14,000 ft. Near Ironton, San Juan Co.; head- 

 waters of Clear Creek ; Pike's Peak ; Seven Lakes ; Gray's Peak ; Cumberland 

 Mines, La Plata Mountains ; mountains above Como ; mountains south of 

 Ward ; Mt. Garfield ; Alpine Tunnel ; Franklin ; Beaver Creek ; Boreas. 



10. Artemisia Pattersonii A. Gray. On alpine peaks of Colo. Alt. 11,000- 

 13,500 ft. Summit of Mt. Garfield ; west slope of Bald Mountain ; Bottomless 

 Pit ; Seven Lakes ; Saddle, Pike's Peak ; Gray's Peak. 



11. Artemisia biennis Willd. In wet places from N. S. to Mackenzie, 

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