354 CARDUACEAE. 



XIV. ADSCENDENTES. 



Heads few in a simple corymb, less than i cm. high ; upper leaves much reduced ; 

 stem 2-3 dm. high, slender. 36. A. armeriaefolius. 



Heads many in a leafy panicle. 



Heads about i cm. high ; stem-leaves thick, lanceolate or oblanceolate. 



37. A. T^veedyi. 



Heads less than i cm. high ; stem-leaves linear or narrowly linear-oblanceolate. 

 Lower leaves oblanceolate ; bracts glabrous, except the ciliate margins ; 



plant 1-3 dm. high. 38. A. adscendens. 



Lower leaves narrowly linear-oblanceolate. 



Plant low, 2-3 dm. high, with a ligneous caudex ; bracts usually hairy on 



the back. n. A. vallicola. 



Plant 3-6 dm. high, from a more or less branched rootstock. 



Bracts more or less hairy on the back. 12. A. Nelsonii. 



Bracts glabrous except the ciliate margins. 39. A. Nuttallii. 



XV. FULCRATI. 



Outer bracts much exceeding the disk ; some twice as long. 



40. A. fulcratus. 

 Outer bracts seldom exceeding the disk. 41. A. Eatonii. 



XVI. FOLIOSI. 



Plant tall, 4-8 dm. high. 



Bracts mainly linear or linear-lanceolate. 42. A. frondeus. 

 Outer bracts broadly lanceolate or oblanceolate. 



Outer bracts mostly acute. 43. A. Canbyi. 



Outer bracts mostly obtuse. 44. A. Burkei. 



Plant low, 1-2 dm. high. 45. A. apricus. 



1. Aster Novae- Angliae L. Low ground from Canada to S. C, Colo, and 

 Sask. Canon City. 



2. Aster campestris Nutt. In valleys from Mont, and Wash, to Colo, and 

 Ore. Alt. up to 9000 ft. Breckenridge ; Dillon ; Manitou ; Laramie River, 

 Larimer Co. 



3. Aster Kumleinii Fries. (A. oblongifolius rigidulus A. Gray) On dry 

 plains and prairies from Minn, to S. D. Alt. 4000-7000 ft. Near Bent's Fort; 

 Cucharas Valley, near La Veta. 



4. Aster Fendleri A. Gray. On plains and sandhills from Kans. and Colo, 

 to N. M. Alt. up to 7000 ft. Arkansas River, above Canon City. 



5. Aster pauciflorus Nutt. Wet saline soil from Sask. to S. D., N. M. and 

 Ariz. Warm soda springs in Animas Valley. 



6. Aster alpinus L. In arctic and alpine places from Mackenzie and Alaska 

 to Colo. Alt. 12,000 ft. Berthoud Pass. 



7. Aster andinus Nutt. On alpine peaks from Mont, to Colo. Gray's Peak ; 

 Mt. Harvard. 



8. Aster griseus Greene. In the mountains of Colo. Alt. about 8000 ft. 

 Doyles. 



9. Aster griseolus Rydb. On the higher mountains of Colo. Mt. Harvard ; 

 Twin Lakes; Breckenridge. 



10. Aster Underwoodii Rydb. On high mountains of Colo, and Wyo. 

 Alt. 8000-10,000 ft. Ironton Park, nine miles south of Ouray; Eldora and 

 Baltimore. 



11. Aster vallicola Greene. In the mountains from Wyo. and Nev. to Colo. 

 Alt. 7000-8500 ft. Alamosa ; Sargent ; Pagosa Springs ; southeast of Ouray. 



12. Aster Nelsonii Greene. In the mountains of Colo, and Wyo. Alt. 7000- 

 8000 ft. lola; Buena Vista. 



