FABACEAE. 
211 
Pod over 1.2 cm. long. 
Pod 2-2.5 cm. long; corolla ochroleucous. 5. P. Candolleana. 
Pod 12-15 mm. long; corolla purple. 6. P. cerussata. 
Pod 3-12 mm. long. 
Pod ovoid; plant 3-6 dm. high ; raceme many-flowered. 
7. P. Bodinii. 
Pods ellipsoid; plant usually less than 3 dm. high ; raceme few-flowered. 
Plant cespitose; stem slender, 1-2 dm. high, slender; leaflets 0.5-1 cm. 
long. 8. P. pauciflora. 
Plant pulvinate-cespitose, almost stemless; leaflets minute. 
9. P. humillima. 
Upper suture of the pod straight or curved upwards, acute; pod in cross-section 
obovate. 10. P. elatiocarpa. 
1. Phaca Eastwoodiae (Jones) Rydb. ( Astragalus Preussii sulcatus 
Jones; A. Eastwoodiae Jones) In Utah and Colo.—Westwater. 
2. Phaca longifolia (Pursh) Nutt. (A. pictus Ulifolius A. Gray) On 
sandy soil from S. D. and Wyo. to Colo, and N. M.—Salida; Manitou; Mani- 
tou Junction. 
3. Phaca picta A. Gray. (A. pictus foliosus A. Gray) In sandy soil from 
Colo, and Utah to N. M.—Denver; Colorado Springs. 
4. Phaca artipes (A. Gray) Rydb. ( Astragalus artipes A. Gray) In the 
mountains of Colo.—Alt. 7000-8000 ft.—Cerro Summit; Cedar Edge; Leroux 
Creek. 
5. Phaca Candolleana H. B. K. ( Astragalus triflorus A. Gray) In dry 
places from Colo, to N. M. and Calif.; also Mex.—Canon City. 
6. Phaca cerussata (Sheld.) Rydb. ( Astragalus cerusatus Sheld.) Moun¬ 
tain sides in Colo.—Canon City, Fremont Co. 
7. Phaca Bodinii (Sheld.) Rydb. ( Astragalus Bodinii Sheld.) In val¬ 
leys from Mont, to Neb. and Colo.—Alt. 4000-5000 ft.—North Park, Larimer 
Co. 
8. Phaca pauciflora Nutt. (A. leptaleus A. Gray) In the mountains of 
Colo.—Alt. 7000-10,000 ft.—Mt. Harvard; North Park, Larimer Co.; Como, 
South Park; Gunnison; Laramie River. 
. 9. Phaca humillima (A. Gray) Rydb. (A. humillimus A. Gray) On arid 
table-lands of Colo.—Mesa Verde, near Mancos River. 
10. Phaca elatiocarpa (Sheld.) Rydb. ( Astragalus lotiflorus brachypus 
A. Gray; A. elatiocarpus Sheld.) On plains from Minn, to Ass. to Mo., 
Tex. and Calif.—Canon City; Colorado Springs. 
11. Phaca Wetherillii (Jones) Rydb. ( Astragalus Wetherillii Jones) 
Dry hills and mesas of Colo.—Grand Junction. 
26. OROPHACA Britton. 
Densely cespitose; flowers 8-10 mm. long; inflorescence not exceeding the leaves. 
Flowers about 10 mm. long; pods puberulent. 1. O. tridactylica. 
Flowers about 8 mm. long; pods hoary. 2. O. aretioides. 
Broadly cespitose with prostrate branches; flowers about 6 mm. long; peduncles 
usually exceeding the leaves; pods hoary. 3. O. sericea. 
1. Orophaca tridactylica (A. Gray) Rydb. ( Astragalus tridactylicus A. 
Gray) On plains and hills of Colorado.—Alt. 5000-6000 ft.—Livermore; 
St. Vrain’s Canon; Ft. Collins; plains near Denver; foot-hills west of Ft. 
Collins; east of Black’s Lake; near New Windsor. 
