APPENDIX. 437 



24. A. LEPTOCARPUS, T. & G. Subglabrous ; pods 1' long, thin, straight, spreading, less reticulated, 

 glabrous ; corolla 4-5" long, curved apex of the keel narrower. — Arkansas ; Texas. 



***** Flowers larger, many, loosely spiked, apex of the keel produced, iuflexed, obtuse ; pod 

 (immature) oblong-linear, sub-obcompressed. Perennial, procumbent ; leaflets linear, acute. 



25. A. Arizonictjs, Gray. Proc. Ama: AcaA. 7. 398. Woody at base, hoary with a strigulose pubes- 

 cence ; leaflets 5-7 pairs ; peduncles exceeding the leaves ; calyx-teeth subulate, equaling the oampanu- 

 late-tube ; corolla 6" long, white, purplish above. — Arizona. 



§ 9». Anomalous species. Pod chartaceous, sessile, 9-12" long, linear- or lance-oblong, arcuately 

 incurved, suboompressed, somewhat suloate dorsally, ventral suture acute, 2-celled, many-seeded, 

 deflexed. Perennial, caulescent, pubescent or villous ; stipules adnate to the petiole, distinct ; 

 spikes many-flowered ; flowers 6-9" long ; peduncles exceeding the leaves. 



26. A. Andersonh, Gray. Pubescence soft ; spikes short. See page 67. 



27. A. MALACUS, Gray. More rigidly villous ; spike elongating. See page 67. 



§ 9''. Anomalous and rather diverse species, near § Oroboidd, but with the pods completely 2-celled or 

 very nearly so, and more symmetrical and terete ; caulescent, perennial, (except A. tener.) 



* Pod curved. 



28. A. BoLANDEKi, Gray. Froc. Amer. Acad,. 7. 337. Cinereous-puberulent, about 1° high ; stipules 

 short, scarious, sheathing ; leaflets 6-9 pairs, sublinear and oblong ; peduncles shorter than the leaf, 

 capitately many-flowered ; pedicels very short, reflexed in fruit ; calyx-teeth subsetaceous, little shorter 

 than the cylindrical tube ; pod coriaceous, ovate, 8-9" long, 3-4" broad, obcompressed, turgid, hamately 

 incurved, acute, stipitate, glabrous, many-seeded, septum perfect; stipe 4" long. — Yosemite Valley, 

 (Bolander.) 



* * Pod straight. 



29. A. AEKECTUS, Gray. Pod oblong, stipitate, erect upon a spreading pedicel. See page 69. 



30. A. ATHATUS, S. Watson. Pod linear, short-stipitate, pendent. See page 69, and Plate XIV. 



31. A. OBSCUKUS, S. Watson. Pod linear, sessile, erect. See page 69. 



32. A. TENER, Gray. Annvial, a span high, erect, strigulose with very short black and whitish hairs ; 

 stipules small, ovate, scarious ; leaflets 5-7 pairs, iinear-cuneate or nearly linear, broadly emarginate or 

 obtuse ; flowers few, capitate, violet, the wings and especially the banner much exceeding the keel ; 

 immature legume more or less deflexed, 6" long, lance-linear, silky-puberuleut, short-stipitate, 10-12- 

 ovuled, 2-oelled, the cross-section obcordate. — California. 



§ 10. SuccuMBBNTES. Pod chartaceous-coriaceous, sessile, long-linear, strongly compressed, falcate 

 upward, bicarinate and deeply sulcate on the back, the ventral suture prominent and acute, 

 2-celled, cross-section Y-shaped. Low, diffuse, flexuous ; peduncles short; stipules free, distinct; 

 flowers i' long, rather loosely capitate, purplish ; calyx cylindrio. 



33. A. SUOOUMBBNS, Dougl. Cinereous-hirsute ; leaflets obovate ; pods erect on spreading pedicels, 

 shining, reticulated. — Oregon. 



§ 11. Galbgiformbs. Pod exsert-stipitate, pendent, coriaceous- or cartilaginous-ohartaceous, very 

 glabrous, straight, narrow, more or less triangular, very deeply sulcate dorsally, the suture in- 

 truded to the middle or beyond. Perennial ; stems erect, stout, sulcate, very leafy ; stipules dis- 

 tinct, free ; flowers in long crowded racemes, rather large, white. 



34. A. Drummondh, Dougl. Softly villous ; calyx scarcely gibbous at base, black-hairy, the subulate 

 teeth shorter than the tube ; pod long-linear, terete with a very deep narrow sulcus, completely or incom- 

 pletely 2-celled, cross-section obcordately 2-lobed ; stipe exceeding the calyx-teeth.— Saskatchewan to 

 Nebraska and the Kocky Mts. 



36. A. EACBMOSUS, Pursh. Appressed-pubescent, glabrate ; calyx strongly gibbous at base, whitish- 

 puberulent, the setaceous teeth slightly shorter than the tube, equaling the stipe ; pod lance-oblong, 

 triangular, not 2-celled, cross-section somewhat equally triradiate.— Nebraska to Idaho. 



§ 12. OCEEATI. Pod sessile, coriaceous, obcompressed or obcompressed-triaugular, with the im- 

 pressed dorsal suture more or less approaching the ventral, but not 2-celled. Low or prostrate per- 

 ennials, caulescent with appressed hairs or strigose ; stipules free from the petiole, united ; flowers 

 spicate, scarcely middle-sized ; calyx-tube usually campanulate. 



36. A. BLAVUS, Nutt. Diffuse, with a fine hoary pubescence ; stipules sheathing the stem and base 

 of the petiole, oblique ; leaflets linear, subacute ; flowers deep-yeUow ; pod 4" long, half-included, hoary, 

 ovate, straight, both sutures impressed and approximate.— Rocky Mts., lat. 41°, (NuttaU.) 



37. A. HTiMiSTRATUS, Gray. Strigose-hairy, subglabrate ; stems long, procumbent ; stipules scarcely 

 sheathing; leaflets lanceolate or linear-oblong, acute; flowers purple, spreading; calyx-teeth exceeding 



