FABACEAE. 209 



Leaflets linear or linear-oblong, acute, ascending. 

 Leaflets narrowly linear, silvery-canescent. 



Low and very cespitose, 1-2 dm. high; pods about 1.5 cm. long; keel 



with a Tery narrow end. 8. H. camporum. 



Tall, 3-4 dm. high, more simple ; pods 2-2.5 cm. long ; keel with a 

 broader end. 9. H. canipesiris. 



Leaflets oblong or lanceolate, strigose but not canescent ; terminal leaflet 

 longer, tapering into the rachis without a distinct articulation ; racemes 

 long and lax. 10. H. decnrrens. 



Leaflets, at least of the lower leaves, oval or elliptical, spreading. 



II. H. hylophilus. 

 Calyx-teeth triangular, Ya-Ys as long as the tube; leaflets linear. 



Low, depressed; pods 12-15 mm. long, sessile. 12. H. tenuifolius. 



Taller, 2 dm. or more high; pods over 15 mm. long, often slightly stipitate. 



13. H. junciforniis. 

 Flexugsi. 



Pod oblong, over 5 mm. in diameter. 



Inflorescence short; flowers about 15 mm. long; pod glabrous. 



14. H. Hallii. 

 Inflorescence elongated and lax; flowers about 10 mm. long; pod pubescent. 



15. H. Fendleri. 

 Pod linear, 2-3 mm. thick. 



Pod abruptly contracted into a short or obsolete stipe. 



Stem decumbent; stipe minute or obsolete. 16. H. flexuosus. 



Stem erect; stipe almost equalling the calyx. 17, H. proximus. 



Pod gradually tapering into the short stipe. 18. H. Salidae. 



Macrocarpi. 

 One species. 19. H. macrocarpus 



1. Homalobus caespitosus Nutt. {Astragalus caespitostis A. Gray.) On 

 dry hills from Ass. and Mont, to Colo, and Utah. — Alt. 4000-6000 ft. — 

 Livermore, Larimer Co. ; north of La Porte. 



2. Homalobus grallator (S. Wats.) Rydb. (A. grallator S. Wats.) On 

 river banks from Colo, to Nev. — Steamboat Springs. 



3. Homalobus wingatanus (S. Wats.) Rydb. {A. Wingatantis S. Wats.) 

 On dry hills in S. Colo, and N. Mex. — Mancos. 



4. Homalobus Clementis Rydb. In the mountains of Colo. — Alt. up to 

 10,000 ft. — Marshall Pass ; Sangre de Cristo ; Big Creek Gulch. 



5. Homalobus tenellus (Pursh) Britton. (Astragalus tenellus Pursh ; As- 

 tragalus viultiHorus (Pursh) A. Gray) On plains and hills from Minn., Sask. 

 and Yukon to Neb., Colo, and Nev. — Alt. 4000-10,000 ft. — Near Empire; 

 Ward, Boulder Co. ; Swallows, between Caiion City and Pueblo ; Estes 

 Park; near mouth of Leroux Creek; Middle Park; Ft. Collins; near Boul- 

 der; mountains between Sunshine and Ward; Marshall Pass. 



6. Homalobus acerbus (Sheld.) Rydb. (A. acerbus Sheld.) In the 

 mountains of Colo. — Alt. about 8000 ft. — Glenwood Springs. 



7. Homalobus decumbens Nutt. {A. dccumhcns A. Gray) In the moun- 

 tains of Colo, and Wyo. — Steamboat Springs. 



8. Homalobus camporum Rydb. On plains and hills from Alb. to Colo, 

 and Utah. — Alt. 8000-10,000 ft. — Grayback mining camps and Placer Gulch; 

 North Park. 



9. Homalobus campestris Nutt. {A. campestris A. Gray; A. convallarius 

 Greene) On plains from Mont, and B. C. to Colo, and Utah. — Alt. up to 



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