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. Homalobus decurrens Rydb. On wooded hills in Colo. Alt. 8000- 

 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 8000 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 junciformis (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 Hallii 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. Fcndlcri A. Gray) On 

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



16. Homalobus flexuosus (Dougl.) Rydb. (Pliaca ftcxuosa Hook; A. ftex- 

 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. (Pliaca 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. n. P. Wethcrillii. 



Pod glabrous. i. P. Eastu'oodiae. 



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. artipcs. 



Pod sessile. 



