CARDUACEAE. 345 



Heads several. z. O. foliosa. 



Head solitary. 3. O. monocephala. 



1. Oonopsis Engelmannii (A. Gray) Greene. (Bigelovia Engclmannii A. 

 Gray) On dry plains from Kans. to Colo. Hugo Station. 



2. Oonopsis foliosa (A. Gray) Greene. (Aplopappus Fremontii A. Gray) 

 On mountains of Colo. Alt. 5000-7000 ft. Pueblo; Fremont Co.; Canon 

 City ; Florence ; Rocky Ford. 



3. Oonopsis monocephala A. Nelson. Only known from the type locality at 

 Berwind, Colorado. 



14. PRIONOPSIS Nutt. 



i. Prionopsis ciliata Nutt. (Aplopappus ciliatus DC.) On hillsides and 

 banks from Mo. and Colo, to Tex. Exact locality not given. 



15. MACRONEMA Nutt. 



Outer bracts oblong, acute. i. M. discoideion. 



Outer bracts broadly oblong, obtuse. 2. M. obtusum. 



1. Macronema discoideum Nutt. (Aplopappus Macronema A. Gray) On 

 the mountains from Colo, and Utah to Calif. Alt. up to 12,000 ft. George- 

 town ; Marshall Pass; Mt. Harvard; Sangre de Cristo; Mt. Ouray. 



2. Macronema obtusum Rydb. In the mountains of Colo. Alt. about 8000 

 ft. South Cottonwood Gulch, Chaffee Co. ; Twin Lakes. 



16. STENOTUS Nutt. 



Bracts lanceolate, acute. i. 5". acaulis. 



Bracts oval or oblong, very obtuse. 2. S. armerioides. 



1. Stenotus acaulis Nutt. (Aplopappus acaulis A. Gray) On hills from 

 Sask. and Wash, to Colo, and Calif. Meeker, Rio Blanco Co. 



2. Stenotus armerioides Nutt. On dry hills and " bad lands " from Man. 

 and Ass. to N. M. Alt. up to 7000 ft. Cimarron. 



17. OREOCHRYSUM Rydb. 



i. Oreochrysum Parryi (A. Gray) Rydb. (Aplopappus Parryi A. Gray; 

 Solidago Parryi Greene) On mountains from Wyo. to N. M. and Ariz. 

 Alt. 7000-12,000 ft. Villa Grove; Silver Plume; southeast of Ouray; Cam- 

 eron Pass; Ruby; Marshall Pass; Minnehaha ; Buffalo Pass, Park Range; 

 Cottonwood Lake ; Grizzly Creek ; Pagosa Peak ; Devil's Causeway, White 

 River Plateau ; Berthoud Pass ; Georgetown ; Silverton ; Mt. Harvard ; moun- 

 tains between Sunshine and Ward ; Vance Junction ; Bitter Creek ; Gray's 

 Peak ; Lake City ; Clear Creek. 



1 8. TONESTUS A. Nelson. 



Bracts acute; plant viscid-puberulent. i. T. Lyallii. 



Bracts obtuse ; plant soft-pubescent or glabrate, scarcely viscid. 2. T. pygmaens. 



i. Tonestus Lyallii (A. Gray) A. Nelson. (Aplopappus Lyallii A. Gray; 

 Pyrrocoma Lyallii Rydb.) On high mountains from Mont, and Wash, to 

 Colo. Clear Creek. 



