204 FABACEAE. 



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

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



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. 2. 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. sparstfonun. 



Pod not mottled ; plant cinereous. 



Pod appressed-pubescent. 6. T. huministratum. 



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



