CICHORIACEAE. 409 



15. Agoseris data (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 Cafion ; 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 

 Carion ; 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. mexicanutn. 

 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. scopuloriDii. 



