378 
CARDUACEAE. 
ranch; Stove Prairie; Granite; Ouray; Ruxton Park; foot of Mt. Harvard; 
hills about Box Canon, west of Ouray; mountains, Larimer Co.; North 
Cheyenne Canon; mountains between Sunshine and Ward; Durango; Horse- 
tooth Mountain; foot-hills, Larimer Co.; Elk Canon; Idaho Springs; Em¬ 
pire; Gray’s Peak; Lake City; headwaters of Clear Creek. 
66. CHAENACTIS DC. 
Annuals. i. C. stevioides. 
Perennials. 
Heads corymbose, short-peduncled ; caudex short, erect. 2. C. Douglasii. 
Heads solitary, rather long-peduncled ; caudex with spreading branches. 
Bracts equalling the disk, only slightly tinged with purple. 3. C. pedicularia. 
Bracts much shorter than the disk, purplish. 4. C. alpina. 
1. Chaenactis stevioides H. & A. In arid places from Ida. and Nev. to 
N. M. and Ariz.—Alt. 4000-6000 ft.—Hotchkiss; Rifle; McElmo Canon; 
Grand Junction; Delta Co.; Palisades. 
2. Chaenactis Douglasii H. & A. In sandy and rocky places from Mont, 
and Wash, to Colo, and Calif.—Alt. 6000-9000 ft.—High rocks, Middle Park; 
North Park; Leroux, Delta Co.; Twin Lakes; Doyle’s; Cimarron; head¬ 
waters of Sangre de Cristo Creek; Grand River Canon; pinon belt, north 
of Mancos; Grayback mining camps and Placer Gulch; Palisades; Elk River, 
Routt Co. 
3. Chaenactis pedicularia Greene. On high mountains of Colo.—Alt. about 
11,500 ft.—Como; Little Kate Mine, La Plata Mountains. 
4. Chaenactis alpina (A. Gray) Jones. (C. Douglasii alpina A. Gray) On 
high mountains from Mont, to Colo, and Utah.—“ Colorado.” 
67. TETRANEURIS Greene. 
Flowering stems scapiform, leafless. 
Leaves densly appressed silky, at least when young. 
Leaves not strongly 3-nerved on the broadened bases. 
Leaves spatulate or oblanceolate, 2-4 cm. long; scape 2-12 cm. high. 
1. T. acaulis. 
Leaves linear or linear-oblanceolate; scape 12-20 cm. high. 
2. T. simplex. 
Leaves strongly 3-nerved on the broadened bases, narrowly oblanceolate. 
3. T. trinervata. 
Leaves loosely villous or glabrate. 
Leaves, scapes and involucres decidedly long-villous. 4. T. lanata. 
Leaves glabrous or sparingly villous; scape finely pubescent (long-villous 
only in T. Torreyana). 
Branches of the caudex copiously villous at the ends, with long, at first 
white, but later brownish hairs. 
Pappus-scales lanceolate, acute ; bracts oblong. 
Crowns of the caudex copiously villous; scape 5-10 cm. long. 
5. T. Torreyana. 
Crowns of the caudex not copiously villous; scape 1-2 cm. high. 
6. T. brevifolia. 
Pappus-scales oval, awned. 
Leaves oblanceolate, hairy. 7. T. arizonica. 
Leaves linear-oblanceolate, or linear-oblong, glabrate. 
Bracts oval. 8. T. pilosa. 
Bracts linear-oblong. 9. T. Crandallii. 
