210 FABACEAE, 



10,000 ft. — ^Lake City; Canon City; Como, South Park; Big South; Stove 

 Prairie Hill ; Gore Pass ; Rabbit-Ear Range ; North Park ; Estes Park ; 

 forks of Poudre and Big South; mountains of Larimer Co.; Pinkham Creek. 



10. Homalobu3 decurrens Rydb. On wooded hills in Colo. — Alt. 8ooo- 

 10,000 ft. — Estes Park; Grayback mining camps and Placer Gulch; Como; 

 Stove Prairie Hill. 



11. Homalobus hylophilus Rydb. On wooded hillsides from Mont, and 

 Ida. to Colo, and Utah. — Alt. about 8ooo ft. — Cerro Summit; North Park, 

 near Teller; Leadville; Empire. 



12. Homalobus tenuifolius Nutt. From the Canadian Rockies to the 

 mountains of Colo. — Lake City. 



13. Homalobus juncifonnis (A. Nels.) Rydb. (Astragalus junciformis A. 

 Nels.) On dry plains and hills from Mont, to Colo, and Utah. — Alt. about 

 7000 ft. — Glenwood Springs; Cedar Edge. 



14. Homalobus Hallii (A. Gray) Rydb. (Astragalus HalUi A. Gray) In 

 the mountains of Colo. — Alt. 7000-10,000 ft. — South Park; Garland; Como, 

 South Park ; Leadville ; Alamosa ; Dolores ; Horsetooth Gulch ; Como, South 

 Park ; Black Canon. 



15. Homalobus Fendleri (A. Gray) Rydb. (A. Fendleri A. Gray) On 

 dry hills of Colo, and N. M. — Alt. 4000-7000 ft. — Mancos; Los Pinos. 



16. Homalobus flexuosus (Dougl.) Rydb. (Phaca Aexuosa Hook; A. Aex- 

 uosus Dougl.) On dry plains and hills from Minn., Sask. and Alb. to Kans. 

 and Colo. — Alt. 4000-9000 ft. — Upper Arkansas ; South Park ; Los Pinos ; 

 Salida; Gunnison; New Windsor; Buena Vista; Veta Pass; Idaho Springs; 

 Sangre de Cristo Creek; Cucharas River, below La Veta; foot-hills, Larimer 

 Co. ; Grayback mining camps and Placer Gulch ; Ft. Collins ; northwest of 

 Soldier Canon; Horsetooth Gulch; Almelia; Estes Park; near Boulder; Em- 

 pire. 



17. Homalobus proximus Rydb. On dry hills of Colo. — Arboles. 



18. Homalobus Salidae Rydb. On hills in Colo. — Salida. 



19. Homalobus macrocarpus (A Gray) Rydb. (Phaca macrocarpa A. 

 Gray; A. lonchocarpus Torr.) In open woods from Colo, and Utah to N. 

 M. — Alt. 6000-10,000 ft.^Pagosa Springs; Thompson Park, La Plata Moun- 

 tains; Turkey Creek and tributaries; Arboles; Durango. 



25. PHACA L. 



Upper suture not acute ; pod circular or oval in cross-section. 

 Pod short-stipitate. 



Pod not mottled, erect or ascending. 



Pod ashy, with minute white hairs. 11. P. Wetherillii. 



Pod glabrous. i. P. Eastwoodiae. 



Pod mottled, spreading or reflexed. 



Leaflets linear or none ; plant grayish-pubescent. 



Terminal leaflet none, represented by the much produced rachis ; lateral 



leaflets also often absent. 2. P. longifolia. 



Leaflets present ; rachis not produced. 3. P. picta. 



Leaflets broadly oval or obcordate ; plant glabrous. 4. P. artipes. 



Pod sessile. 



