CICHORIACEAE. 409 



15. Agoseris elata (Nutt.) Greene. (Troximon Nuttallii A. Gray) In 

 rich low ground from Mont, and B. C. to Colo, and Calif. Alt. 7000-10,000 

 ft. Glenwood Springs; La Veta; Veta Pass; Cameron Pass; Horsetooth 

 Gulch. 



16. Agoseris purpurea (A. Gray) Greene. (Troximon auranthiacum pur- 

 pureum A. Gray) In the mountains of Colo, and N. M. Alt. about 9000 

 ft. Table Rock; Minnehaha; near Pagosa Peak; Rogers. 



17. Agoseris Greenei (A. Gray) Rydb. (Troximon gracilens Greenei A. 

 Gray) In meadows from Alb. and B. C. to Colo. Alt. about 8000 ft. Min- 

 nehaha; Chicken Creek. 



18. Agoseris gracilens (A. Gray) Greene. (Troximon gracilens A. Gray) 

 In meadows and on hillsides from Mont, and B. C. to Colo, and Utah. Alt. 

 8000-12,000 ft. Steamboat Springs; West Indian Creek; Bear River, Routt 

 Co.; Pike's Peak; Bob Creek; mountain near Veta Pass; Red Mountain; 

 between Cheyenne Mountain and Seven Lakes; West Mancos Canon; Gray- 

 back mining camps ; Pass Creek ; Mt. Harvard ; North Fork of Cache la Pou- 

 dre River; Buffalo Pass; Anita Peak; summit of North Park Range, Routt 

 Co. 



19. Agoseris humilis Rydb. In the mountains of Colo, and Wyo. Alt. 

 about 9000 ft. Ironton Park, nine miles south of Ouray; Breckenridge ; Ten- 

 nessee Pass. 



20. Agoseris aurantiaca (Hook.) Greene. (Troximon aurantiacum Hook.) 

 In mountain meadows and on banks of streams from Mont, and B. C. to 

 Colo. Alt. 6000-13,000 ft. Steamboat Springs; Pike's Peak; Tennessee Pass; 

 Delta Co.; near Teller, North Park; Mt. Hesperus; near Ironton, San Juan 

 Co. ; Franklin. 



21. Agoseris arizonica Greene. (A. elongata Greene) In the mountains of 

 Colo., N. M. and Ariz. Alt. 7000-9000 ft. Grayback mining camps; Black 

 Canon; near Pagosa Peak; Piedra. 



22. Agoseris rostrata Rydb. In the mountains of Colo. Alt. 8000-9000 ft. 

 Lower Boulder Canon; mountains between Sunshine and Ward; Bear 

 Creek. 



14. TARAXACUM Hall. DANDELION, BLOWBALL. 



Outer bracts (calyculum) more or less squarrose. 



Outer bracts reflexed from the base; leaves deeply runcinate with triangular 



teeth. 

 Bracts numerous ; leaves broad and the terminal lobe large. 



i . T. Taraxacum. 



Bracts few; leaves narrow and the terminal lobe small. 2. T. mexicanum. 

 Outer bracts or most of them appressed at the base and with spreading or re- 

 flexed tips ; leaves with short lobes or sinuate. 



Bracts conspicuously corniculate ; the outer about two-thirds as long as the 

 inner; achenes spinulose-toothed above and tuberculate on some of the 

 ribs to near the base. 3 . T. dumetorum. 



Bracts, at least the outer ones, not corniculate; these about half as long 

 as the inner; achenes merely tuberculate above, smooth below; leaves 

 dark green. 4. T. leiospermum. 



Outer bracts wholly appressed, short. 



Plant not dwarf; scape 5-20 cm. high; involucres 15 mm. high or more. 



5. T. montanum. 



Plant dwarf; scape 2-5 cm. high; involucres 6-8 mm. high and about 5 mm. 

 wide. 6. T. scopulornm. 



