254 AMMIACEAE. 



1. Aulospermum longipes (S. Wats.) C. & R. (Cymopterus longipes S. 

 Wats.) In dry soil from Wyo. to Colo, and Utah. Yampa River. 



2. Aulospermum angustum Osterhout. In dry places of Colo. Steamboat 

 Springs; Hayden. 



3. Aulospermum planosum Osterhout. In dry places of Colo. Minturn; 

 Steamboat Springs. 



4. Aulospermum purpureum (S. Wats.) C. & R. (Cymopterus purpureus 

 S. Wats.)" In dry places from Colo, and Utah to N. M. and Ariz. Alt. 

 6000-7000 ft. Mancos; Cimarron; Durango; Ridgway. 



14. PHELLOPTERUS Nutt. 



Peduncles, even in fruit, shorter than the leaves ; fruit 6-8 mm. long. 



i. P. montanus. 

 Peduncles, at least in fruit, equalling or exceeding the leaves ; fruit over 8 mm. 



long. 



Involucels i-3-nerved. 2. P. purpurascens. 



Involucels s-g-nerved. 3. P. camporum. 



1. Phellopterus montanus Nutt. (Cymopterus montanus T. & G.) In dry 

 places from S. D. and Wyo. to Ark. and Colo. Alt. 4000-7000 ft. Colorado 

 Springs; Ft. Collins; Pueblo; New Windsor; Denver. 



2. Phellopterus purpurascens (A. Gray) C & R. (Cymopterus montanus 

 purpurascens A. Gray) In dry places from Colo, and Utah to Tex. and Ariz. 

 In Colorado it is represented only by the var. Eastwoodiae (Jones) C. & R. 

 which is more robust, with more open inflorescence and narrower wings to 

 the fruit. Alt. 6000-8000 ft. Hermosa; Mancos; Cerro Summit. 



3. Phelopterus camporum Rydb. Dry mesas of S. Colo. Alt. about 5000 

 ft. Mesas near Pueblo. 



15. PTERYXIA Nutt. 



i. Pteryxia foeniculacea Nutt. (Cymopterus foeniculaceus T. & G.) In 

 dry places from Ida. and Wash, to Colo., Utah and Ore. Alt. about 8500 ft 

 Columbine; Steamboat Springs. 



16. OROGENIA S. Wats. TURKEY PEA. 



i. Orogenia linearifolia S. Wats. On mountain ridges from Ida. and Wash, 

 to Colo, and Ore. Mancos ; Rabbit-Ears, Routt Co.; Steamboat Springs. 



17. SIUM L. WATER PARSNIP. 



i. Slum cicutaefolium Gmelin. In water from Newf. and Mackenzie to 

 Va. and Calif. Alt. 4000-8000 ft. Parlin, Gunnison Co. ; Gunnison ; San 

 Luis Valley. 



1 8. OXYPOLIS Raf. 



i. Oxypolis Fendleri (A. Gray) Heller. (Archemora Fendleri A. Gray) 

 Along brooks and in springy places from Wyo. to N. M. Alt. 8000-11,000 ft. 

 Headwaters of Clear Creek; Upper Corral Creek; Idaho Springs; Marshall 

 Pass; Ruby; Robinson; near Pagosa Peak; East Indian Creek; mountain 

 near Veta Pass; headwaters of Sangre de Cristo Creek; Grayback mining 



