140 



FABACEAE 



Calyx-teeth about one-fourth as long as the tube; corolla about 12 mm. 

 long. 6. C. araneosum. 



Pod 1-1.5 cm. long. 7. C. salinum. 



20. ONIX Stev. 



21. 



1. O. Mulfordae. 



GEOPRtJMNON Rydb. Buffalo Beans, Ground Plums, Buffalo 



Peas, Praibie Apples. 



Pods pubescent, abruptly pointed. 

 Pods glabrous, pointless. 



Corolla purple; leaflets oblong to linear. 



Corolla yellowish-white, with purple keel; leaflets oval or obovate. 



1. G. plattense. 

 2. G. crassicarpum. 



3. G. succulenium. 



22. ASTRAGALUS (Tourn.) L. Loco Weed, Milk Vetch. 



Plants cespitose, subscapose, viUous-pubescent; pods sulcate on both sutures. 



I. Mollissimi. 

 Plants with elongate leafy stems. 



Pods not sulcate or slightly so on the lower suture, round or nearly so in cross-section. 



II. Uliginosi. 

 Pod deeply sulcate on the lower suture, cordate or triangvilar in cross-section. 



Leaves and stems strigose or glabrate; pods several-seeded. III. Htpoglottides. 

 Leaves and stem villous; pods few-seeded. IV. Spaldingiani. 



I. Mollissimi. 

 Pod glabrous, deeply sulcate. 

 Pod villous, slightly sulcate. 



Calyx densely villous; leaflets 6-12 pairs. 

 Pods perfectly 2-celled; raceme elongate. 

 The cells of the pod confluent at the apex; raceme short. 

 Calyx sparingly nigrescent; leaflets 3—6 pajrs. 



1. A. moHissimus. 



2. A. Bigelovii. 



3. A. Thompsonae. 



4. A. anisus. 



• II. Uliginosi. 

 Pod straight or nearly so. 



Calyx-tube 4-6 mm. long, 3—4 mm. wide. 



Bracts linear-lanceolate, long-attenuate, the lower almost as long as the calyces; 

 calyx-teeth all narrow, subulate, fully half a,s long as the tube; pod glabrous. 



5. A. canadensis. 

 Bracts ovate to lanceolate, scarcely half as long as the calyces; calyx-teeth short, 

 less than half as long as the tube, the upper broader; pod more or less 

 hairy (except sometimes in the first) . 

 Upper calyx-teeth only slightly broader than the lower; bracts lanceolate. 

 Calyx not black-hairy; pod not sulcate. 6. A. oreophilus. 



Calyx more or less black-hairy; pods somewhat sulcate on the lower suture. 



7. A. MoTtoni. 

 Upper calyx-teeth about twice as broad as the lower, broadly triangular at 

 the base; pod not sulcate. 8. A. spicatus. 



Calyx-tube about 3 mm. long, less than 2 mm. wide. 9. A. ursinus. 



Pod decidedly arcuate. 18. A. palans. 



III. Htpoglottides. 

 Pod with appressed gray or black pubescence. 



Calyx-teeth short and broad; corolla purple. 10. A. terminalis. 



Calyx-teeth subulate. 



Corolla piirple or pink, seldom white; calyx-teeth much shorter than the tube. 



11. A. slHatus. 

 Corolla sulphur-yellow, white, or pinkish; calyx-teeth almost equalling the tube. 

 Leaflets elHptic, appressed-pubescent. 12. A, sulphurescens. 



Leaflets broadly obovate; pubescence looser. 13. A. oreganus. 



Pod villous with long spreading hairs. 



Corolla ochroleucous; bracts broadly spatulate to linear, obtuse. 



14. A. virgullulus. 

 Corolla piuple; bracts ovate-lanceolate or oblong-lanceolate, often acutish. 

 C3alyx black-hairy; teeth decidedly shorter than the tube. 15. A. goniatus. 

 Calyx not black-hairy; teeth about equalling the tube. 16. A. agrestis. 



One species. 



IV. Spaldingiani. 



17. A. Spaldingii. 



23. HAMOSA Medic. 

 Plant acaulescent, sUvery white. 



Racemes several-flowered; calyx-teeth triangular-lanceolate, about one-third as long 

 as the tube. 1. H. scaposa. 



Racemes 1-2-flowered; calyx-teeth elongate-lanceolate, more than luilf as long as the 



tube. 



Plant caulescent, not silvery. 

 Legume curved. 



Plant glabrous or strigose. 



Pod less than 3 mm. wide, not mottled; coroUa 5-6 mm. 

 Leaflets lanceolate or oblong ; pod flnely strigose. 

 Leaflets cuueate or oblong, emarginate; pod glabrous. 



2. H. calycosa. 



long. 



3. H. austrina. 



4. H. NuUalHana. 



