436 BOTANY. 



viUous often yeUow pubescence ; peduncles long, scape-like; spikes dense; flowers rather large, 

 violet ; calyx tubular. 



11. A. MOLLissiMus, Torr. Pod naxrow-oblong, 5-9" long, glabrous, subdidymons ; ovary also 

 glabrous. — Nebraska to W. Texas. 



12. A. BiGELOvn, Gray. Pod oval-oblong, 6" long, coriaceous, densely -woolly, but slightly sulcate.— 

 W. Texas ; New Mexico ; Chihuahua. 



§ 5. ULIGINOSI. Pod coriaceous, turgid, oblong, terete, scarcely sulcate and only on the back, 

 nearly straight, sessile, septum perfect. Perennial, tall, with appressed gray pubescence or glab- 

 rate ; spikes dense ; flowers whitish, ochroleucous or purplish, spreading or deflexed ; pods erect, 

 crowded, 6" long ; stipules distinct or united, free. 



13. A. Canadensis, L. See pages 67, 68. 



5 6. ONOBEYCHIDES. Pod coriaceous, oblong or ovate, straight, usually more or less compressed- 

 or obcompressed-triangular, dorsaUy sulcate, (cross-section oboordate,) 2-oelled, pubescent, many- 

 ovuled. Perennial, caulescent, grayish short-pubescent or glabrate, ascending or decumbent; 

 stipules more or less sheathing ; flowers in dense spikes or small heads, middle-sized, violet or pur- 

 ple, ascending ; pods ascending. 



14. A. ADSUEGENS, Pall. Eather stout ; spike oblong ; pod sessile. See page 68. 



15. A. HYPOGLOXTis, L. Slender ; flowers capitate ; pod short-stipitate. See page 68. 



§ 7. KEFLEXI. Pod thick-coriaceous, sessile, deflexed, ovate-triangular, very deeply sulcate dorsally , 

 (section obcordately 2-lobed,) 2-celled, cells 3-4-ovuled; keel falcate, attenuate upward, equal- 

 ing the narrow banner, exceeding the wings. Annual, slender, pilose-pubescent ; leaflets emar- 

 ginate ; flowers nearly sessile, rather few, subcapitate, bluish-white, spreading. 



16. A. RBFLEXCS, T. & G. Flowers scarcely 3" long ; pod 4" long, glabrous.— Texas, (Drummond.) 

 § 8. DIDTMOCAEPI. Pod thin-coriaceous, obcompressed-didymous with a narrow perfect septum, 



transversely ridged or reticulated, at length separating into two 1-2-seeded divisions, mostly de- 

 flexed; ovary short-stipitate. Annual, caulescent, rather small, sparingly pubescent; stipules 

 distinct, nearly free ; leaflets emarginate; spikes short, dense ; flowers small, violet or whitish, 

 keel strongly inflexed. 



17. A. DiDYMOCABPUS, H. & A. FlowcTS sessile ; pod small, strongly rugose, hirsutish, scabrous or 

 glabrate ; cells 1-ovuled, nearly filled by the seed ; stipe very short. — California. 



18. A. Brazoensis, Buck. Flowers rather loose, pedicels very short ; pod strongly obcompressed and 

 nearly disk-like, 3" broad, incurved, glabrous, transversely nerved ; cells 2-ovuled, mostly 1-seeded ; 

 stipe equaling the calyx. — W. Texas. 



§ 9. MICEANTHI. Pod coriaceous, oblong, lanceolate, or linear, straight or curved, sessile, dor- 

 sally sulcate, ventral suture rather prominent, 2-celled, many-ovuled. Low or slender, mostly 

 annual, caulescent ; stipules distinct, nearly free ; flowers small or approaching middle-size, violet 

 or whitish, keel incurved above or very obtuse; calyx-tube short. — Species dissimilar. 



* Flowers and pods deflexed, numerous, densely spiked ; peduncles elongated; 1° high or more, 

 strigose-puberulent. 



19. A. VACCAEUM, Gray. Perennial, cinereous-puberulent ; calyx-teeth equaling the tube ; corolla 

 incurved, white or purplish ; pod lance-oblong, arcuate, hirsutish, section broad-obcordate. — Arizona. 



20. A. Haetwegi, Benth. Greener ; calyx-teeth shorter than the tube ; corolla nearly straight. — 

 Arizona ; Mexico. Pod unknown. 



* * Flowers rather few in a loose raceme, and pods pendent ; low, glabrous. 



21. A. CoBKENSis, Gray. Diffuse ; leaflets retuse ; pedicels nearly equaling the calyx-tube ; corolla 

 purplish ; ovary short-stipitate ; pod obcompressed, oblong, straight, broadly concave on the back, ses- 

 sile. — ^New Mexico. 



* * * The few capitate flowers and oblong pods erect ; calyx-teeth subulate-linear, much exceeding 

 the tube, equaling the corolla. Annual, low, villous-hirsute. 



22. A. "Wkightu, Gray. Pod straight, subcompressed, bicarinate, acute, half-longer than the calyx ; 

 style very short. — Texas. 



* * * » Flowers few, subcapitate or subsolitary, rather small, apex of the keel slightly produced, 

 inflexed, banner much longer ; pod linear, subcompressed, bicarinate. Annual, low, difl'use ; leaf- 

 lets mostly retuse. 



23. A. NUTTAIXIANUS, DC. Pods curved. See page 68. 



