356 CARDUACEAE. 



32. Aster corymbiformis Rydb. In meadows in Colo. Alt. 5000-8000 ft. 

 Parlin, Gunnison.Co. ; Ft. Collins; Westcliffe; Denver. 



33. Aster longulus Sheldon. In wet meadows from Minn, and Alb. to Neb. 

 and Colo. Twin Lakes; Westcliffe. 



34. Aster lonchophyllus Greene. In the mountains of Colo. Alt. 8000- 

 10,000 ft. Crested Butte; Gore Pass. 



35. Aster Fremontii A. Gray. In valleys from Mont, to Colo. Alt. 9000- 

 12,000 ft. Cameron Pass; Breckenridge; Michigan; Trappers' Lake; Ironton 

 Park, nine miles south of Ouray ; Sherwood's ; Laramie River ; Robinson ; 

 Twin Lakes; Marshall Pass; Ruxton Park; Lake City. 



36. Aster armeriaefolius Greene. In the mountains of Wyo. and Colo. 

 Alt. 8000-10,000 ft. Doyles ; Marshall Pass ; Laramie River, Larimer Co. ; 

 Grizzly Creek; Bosworth's ranch, Stove Prairie. 



37. Aster Tweedyl Rydb. In valleys of Wyo. and Colo. Alt. about 5000 

 ft. Near Laramie River, Larimer Co. 



38. Aster adscendens Lindl. In valleys from Ass. to Colo, and Nev. Alt. 

 8000-10,000 ft. Near Empire; mountains between Sunshine and Ward; Ft. 

 Collins ; Grizzly Creek. 



39. Aster Nuttallii T. & G. (A. orthophyllus Greene) In the mountains 

 from Wyo. to Colo, and Calif. Alt. 5000-8000 ft. Gunnison; Ft. Collins; 

 Cerro Summit; Montrose. 



40. Aster fulcratus Greene. In valleys of Colo. Alt. about 9000 ft. Near 

 Pagosa Peak. 



41. Aster Eatonii (A. Gray) Howell. (A. foliaceus Eatonii A. Gray; 

 Brachyactis hybrida Greene) In the mountains from Mont, and B. C. to 

 Colo, and Calif. Alt. about 5000-8000 ft. Poudre River; Gunnison; Upper 

 Arkansas; Cheyenne Canon. 



42. Aster frondeus (A. Gray) Greene. (A. foliaceus frondeus A. Gray; 

 Aster glastifolius Greene) In the mountains from Ida. and B. C. to Colo, 

 and Nev. Alt. 8000-10,000 ft. Empire ; near Laramie River, Larimer Co. ; 

 Ruxton Dell; near Pagosa Peak; Mt. Harvard. 



43. Aster Canbyi Vasey. In the mountains of Colo. Alt. 8000-11,000 ft. 

 Crested Butte ; McCoy ; near Grand Lake ; Mt. Harvard ; mountains between 

 Laramie River and North Park; Gypsum; Berthoud Pass; canon west of 

 Palmer Lake. 



44. Aster Burkei (A. Gray) Howell. (A. foliaceus Burkei A. Gray) In 

 the mountains from Wyo. and Wash, to Colo, and Ariz. Robinson; Steam- 

 boat Springs ; Hotchkiss. 



45. Aster apricus (A. Gray) Rydb. (A. foliaceus apricus A. Gray) On 

 alpine peaks from Mont, and B. C. to Colo, and Ore. Alt. 8000-12,000 ft. 

 Gray's Peak ; Twin Lakes ; Westcliffe ; Boreas ; Buffalo Pass ; Empire ; Bert- 

 houd Pass; Grizzly Creek. 



29. MACHAERANTHERA Nees. 



Leaves twice pinnatifid ; root annual; achenes terete. i. M. tanacetifolia. 



Leaves spinulose-toothed ; plant perennial or biennal ; achenes compressed. 



Bracts linear-subulate; green tips of most of them longer than the straw- 

 colored lower portion, squarrose-reflexed. 

 Stem and inflorescence distinctly viscid. 



