204 FABACEAE. 



enne Canon; Walsenburg; Little Veta Mountain; Colorado Springs; Mt 

 Harvard; west of Soldier Canon; La Porte; Como; Redcliflfe. 



7. Astragalus sulphurescens Rydb. On hills and mountains of Colo. — 

 Alt. 5000-10,000 ft. — Boulder Canon; Georgetown; Platte River, Denver; 

 Estes Park; vicinity of Como; Long Gulch; near Boulder; Empire. 



8. Astragalus virgultatus Sheld. (A. hypoglottis bracteosus Osterh.) In 

 mountain meadows of Colo, and Wyo. — Alt. 5000-8000 ft. — Boulder ; Gunnison. 



9. Astragalus goniatus Nutt. (A. hypoglottis polyspermus T. & G. ; A. 

 hypoglottis Richardson; not L.) In meadows and river valleys from Sask. 

 and Wash, to Colo, and Calif.- — Alt. 4000-9000 ft. — Boulder; Valmont; Ala- 

 mosa ; Parlin, Gunnison Co. ; Cimarron ; Salida ; butte five miles southwest 

 of La Veta; Ft. Collins; Dillon; Buena Vista; Arboles; Cucharas River, 

 below La Veta ; Pagosa Springs ; Stove Prairie, Larimer Co. ; near La Plata 

 Post Office; Sangre de Cristo Creek; Table Rock; Horsetooth Gulch; Do- 

 lores ; Como ; Colorado City. 



12. HAMOSA Medic. 



Plant acaulescent, silvery-white. i. A. scaposa. 

 Plant caulescent, not silvery. 



Pods curved. ^. H. Nuttalliana. 



Pods straight. 3. H. leptocarpa. 



1. Hamosa scaposa (A. Gray) Rydb. {Astragalus scaposus A. Gray.) 

 On dry hills from Wyo. to N. M. and Ariz. — McElmo Canon. 



2. Hamosa Nuttalliana (DC.) Rydb. (_A. Nuttallianus DC.) In dry soil 

 from Colo, and Ark. to Tex. and N. M. — Alt. 4000-5000 ft. — Palisades. 



3. Hamosa leptocarpa (T. & G.) Rydb. {A. leptocarpus T. & G.) In dry 

 soil from Tex. to Colo. — Lake City. 



13. CYSTIUM Stev. 



I. Cystium diphysum (A. Gray) Rydb. {Astragalus diphysus A. Gray) 

 On hills from Colo, and Utah to N. M. and Ariz. — " Southwestern Colo- 

 rado " (Brandegee) ; exact locality not given. 



14. TIUM Medic. 



Stipe equalling or exceeding the calyx ; pod not incurved. 

 Pods not black-hairy ; corolla white or ochroleucous. 



Plant villous; pod cordate in cross-section. i. T. Drummondii. 



Plant appressed-pubescent or glabrous ; pod more or less triangular or inverted 

 V-shaped in cross-section. 

 Calyx not black-hairy; pod straight. 2. T. racemosum. 



Calyx black-hairy; pod arcuate. 3. T. scopulorum. 



Pod black-hairy; corolla purple. 4. T. alpinum. 



Stipe shorter than the calyx or almost none ; pod incurved. 



Pod mottled; plant green. 5. T. sparsiHorum. 



Pod not mottled ; plant cinereous. 



Pod appressed-pubescent. 6. T. huministratum. 



Pod hirsute-villous with spreading hairs. 7. T. desperatum. 



