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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. 
1. P. montanus. 
Peduncles, at least in fruit, equalling or exceeding the leaves; fruit over 8 mm. 
long. 
Involucels 1-3-nerved. 2. P. purpurascens. 
Involucels 5-9-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. 
1. 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. 
1. 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. 
1. Sium 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. 
1. 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 
