518 FAB ACE AE 



Stipules adnate to the petioles only slightly at the base; pods pendent, 1-celled, many 



times exceeding tlie calyx; plant often caulescent. I. Deflexi. 



Stipules decidedly adnate to the petioles; pods not pendent; plant acaulescent. 

 Leaves strictly pinnate; leaflets opposite. 



Fruiting calyx inflated, enclosing the fruit; plants densely cespitose, less than 



1.5 dm. high. II. Nani. 



Fruiting calyx not inflated, much exceeded by the pod. 

 Inflorescence l-:3-flowered ; plants dwarf, pulvinate. 



Pods inflated, 1-cefled, ovoid. III. INFLATI. 



Pods not inflated, oblong, almost 2-celled. IV. P.vrry.\ni. 



Inflorescence many-flowered; plants mostly over 1.5 dm. high, not pulvinate; 

 pod oblong, not inflated. V. Campestres. 



Leaflets verticiUate. VI. Verticillares. 



I. Deflexi. 

 Plant more or less caulescent; racemes at least in fruit elongate; pods 1.5-1.8 cm. long. 



1. A. deflexus. 

 Plant suba caulescent; racemes short and head-like; pods about 1 cm, long. 



2. A. foliolosus. 

 II. Nani. 



Peduncles scarcely exceeding the leaves, 1-3-flowered; bracts broadly ovate. 



Leaflets 5-10 mm. long; corolla 20-25 mm. long. 3. A. muUiccps. 



Leaflets 3-6 mm. long; corolla about 15 mm. long. 4. A. minor. 



Peduncles decidedly exceeding the leaves, many-flowered; bracts lanceolate or ovate- 

 lanceolate. 

 Pubescence of the peduncles appressed or meiely ascending; pods included in the 

 calyx. 

 Peduncles erect, strict; spike oblong, ovei 2 cm. long. 



Corolla yellow or wliitish, more than 2 cm. long. 5. A. collinus. 



Corolla piu-ple, less than 2 cm. long. 6. A. Blankinshipii. 



Peduncles ascending, curved; spike subcapitate. 7. A. nanus. 



Pubescence of the peduncles loosely spreading; pods usually somewhat exserted. 



8. A. Lagopus. 



III. INFL.\TI. 



Leaflets 11-23. < 



Leaflets sparingly appressed-hirsute. 9. A. podocarpus. 



Leaflets densely can&scent. 10. A. Hallii. 



Leaflets 5-11, densely canescent. 11. A. oreophilus. 



IV. Parryani. 

 One species. 12. A. Parryi. 



V. Campestres. 

 Plant not viscid. 



Corolla piu-ple, rarely white. 

 Calyx with spreading hairs. 



Calyx wliite-hairy ; corolla usually light purple. 



Plant loosely pubescent; peduncles with long spreading hairs. 



8. A. Lagopus. 

 Plant siUcy-cane-scent ; peduncles with appressed hairs. 



Plant low, densely cespitose; pedimcles ascending, curved, less than 



5 cm. high; soike capitate. 13. A. argophyllus. 



Plant taller, over 1 dm. high; spike elongate. 



Calyx long-hairy; wings broad. 14. A. Besseyi. 



Calj'x short-hairy; wings narrow. 21. A. albertinus. 



Calyx black-hairy; corolla dark, bluish purple. 



Plant white or grayish villous. 15. A. atropurpureus. 



Plant silky, with apjiressed hairs, green. 16. A. melanodonlus. 



Calyx with appressed hairs. 



Legumes about 3 cm. long, short-stipitate and long-acuminate; corolla over 2 



cm. long. 17. A. Bigelovii. 



Legume 2 cm. long or less, sessile. 



Legumes villous, almost 2-celled; caudices densely wliite-hairy ; corolla 12 



nun. long. 18. A. plnttensis. 



Legumes appressed-silky or short-hairy ; caudices not conspicuously white- 

 hairy. 

 Legume nearly 2-ceIled; leaves white-silky. 



Corolla 12-15 mm. long; wings slightly emarginate. 



19. A. monticola. 

 Corolla about 2 cm. long; wings broadly and deeply emarginate. 



20. A. sericeus. 

 Legumes only half 2-celled. 



Leaves white-silky beneath; corolla 15 mm. long; pod ascending. 



21. A. albertinus. 

 Leaves green or only slightly silky. 



Legumes spreading; leaves elliptic or oblong; corolla 15 mm. 



long. 22. A. dispar. 



Legumes erect or strongly ascending; leaflets lanceolate or linear- 

 lanceolate, very acute. 

 Leaves spreading; pod 15 mm. long, abruptly contracted 

 into a short spreading beak; corolla 15 nmi. long. 



23. A. anguslatus. 

 Leaves erect; pod 20 mm. long, long-acuminate, neatly 

 straight; corolla 18-20 mm. long. 24. A. Lambcrtii. 



