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 pur pur ens 

 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 foeniculaceits 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. 



18. OXYPOLIS Raf. 



i. Oxypolis Fendleri (A. Gray) Heller. (Archcmora Fcndleri 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 



