564 FABACEAE 



Pods strigose, usually mottled, 25-30 mm. long. 13. A. californicus. 



Pods erect; leaflets linear. 14. A. Tweedyi. 



Pods distinctly curved. 



Pods curved less than a circle. 

 Stem and leaves pubescent. 



Stem and leaves long-villous. IS. A. Gibbsii. 



Stem and leaves pubescent with incurved hairs. 16. A. Whitedii. 



Stem and leaves glabrous, except for a sparse pubescence on the lower surface of the leaves. 



17. A. subglaber. 



Pods spirally curved, forming one and a half to two coils; leaflets linear or oblong. 



Corolla about 10 mm. long; pod 4-4.5 mm. broad, strongly reticulate. 



18. A. speirocarpus. 



Corolla 5-6 mm. long; pod 3-3.5 mm. broad. 19. A. alvordensis. 

 Sutures of pods thick and coriaceous; leaflets linear. 



Stipe nearly as long as the flat body of the pod. 20. A. sclerocarpus. 



Stipe about half as long as the more turgid body of the pod. 21. A. bicristatus. 



III. Cnemidophacos. 



Cespitose perennials; racemes strict, many-flowered; calyx-tube deeply campanulate, the teeth linear-lanceo- 

 late, equaling the tube; corolla yellow or white; pod coriaceous, oblong-ovoid, rounded dorsally, and somewhat 

 depressed on the upper side, 1-celled, without a partial partition or rarely with a rudimentary one; upper suture 

 usually prominent. 



Pods glabrous; calyx black-hairy. 22. A. reventus. 



Pods pubescent with long hairs; calyx white-hairy. 23. A. hoodianus. 



IV. Xylophacos. 



Low often subacaulescent perennial herbs, usually copiously pubescent ; racemes densely flowered, short or 

 subcapitate; calyx cylindric, the lobes shorter than the tube; corolla purple or ochroleucous, or in one species 

 crimson; pod coriaceous or woody, 1-celled, sessile, straight or incurved, the lower suture often slightly sulcate. 



Pods glabrous, strigose or short-pilose. 



Stems glabrous; leaves broadly elliptic or oval; pods coiled to almost a complete circle. 



24. A. iodanthus. 

 Stems decidedly strigose; leaves linear or oblong-linear. 



Pods strigose; leaves linear, rather sparingly strigose. 25. A. Casei. 



Pod glabrous; leaves narrowly oblong-obovate, densely silky-canescent. 26. A. Webberi. 



Pods long-villous. 



Corolla purple or ochroleucous. 



Pubescence of the leaves strictly appressed. 27. A. Newberryi. 



Pubescence of the leaves loosely villous. 



Corolla usually 20-30 mm. or at least over 15 mm. long. 



Calyx-teeth about half as long as the tube; bracts subulate; pod strongly incurved. 



Stems 1-3 dm. high; pod 20-25 mm. long, bent at the middle; corolla purplish. 



28. A. inflexus. 



Stems less than 1 dm. high; pod 20 mm. long, abruptly bent above the middle, corolla 

 ochroleucous, the keel purple-tipped. 29. A. incurvus. 



Calyx-teeth less than one-third the length of the tube; stems usually less than 1 dm. high. 

 Leaflets obovate, mostly rounded to retuse at the apex. 



Calyx black-hairy; corolla bluish, 25-30 mm. long. 30. A. funereus. 



Calyx white-hairy; corolla rose-purple, 25 mm. long. 31. A. utahensis. 

 Leaflets elliptic or lanceolate, acute or obtuse. 



Corolla ochroleucous or white, the keel only tipped with purple. 



32. A. Purshii. 

 Corolla purple or purple-tinged. 



Peduncles not exceeding the leaves. 



Leaflets oblanceolate, acute; pod long-acuminate. 



33. A. glareosus. 



Leaflets elliptic, obtuse; pod short-acuminate. 34. A. candelarius. 



Peduncles in flower exceeding the leaves; pod short-acuminate. 



35. A. Icucolobus. 

 Corolla not over 15 mm. long. 



Leaflets broadly obovate; keel purple-tipped, corolla otherwise ochroleucous. 



36. A. Jonesii. 



Leaflets oblanceolate; corolla purple. 37. A. lectulus. 



Corolla crimson, even when dry. 38. A. coccineus. 



V. Pterophacos. 



Perennials with a woody cespitose caudex; leaflets linear to filiform; corolla white or purple; pod sessile, 

 woody, 1-celled, the valves winged on the back, the sutures prominent, often narrowly winged. 



A single species in the Pacific States. 39. A. cinerascens. 



VI. Phaca. 



Perennial or annual; calyx campanulate; corolla ochroleucous or purple; keel beakless; pod membranous, 

 inflated, sessile or stipitate, 1-celled, with neither suture intruded, without even a partial partition; seeds nu- 

 merous. 



Pods papery, indehiscent, or tardily splitting. 

 Pods distinctly stipitate. 



Pod acuminate at each end, somewhat compressed. 40. A. o.ryphysus. 



