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NORTH AMERICAN FLORA 



[Volume 24 



Leaflets elliptic, spreading; pod 3-4 cm. long, the upper suture straight. 36. P. allochroa. 

 Leaflets linear-oblanceolate, more or less reflexed; pod about 2.5 cm. long, 



both sutures convex. 37. P. piscina. 



38. P. unde. 



39. P. densifolia. 



11. Densifoliae 

 Pod pubescent. 



Leaflets and calyces loosely villous. 

 Plant densely white-pubescent. 

 Plant merely canescent. 

 Leaflets and calyces appressed -pubescent or glabrate. 



Calyx-teeth lanceolate or lance-deltoid, about half as long as the tube. 

 Calyx-teeth subulate, about as long as the tube. 

 Pod glabrous; leaves sparingly villous or glabrous. 



12. Candidissimae 



Plant silvery-silky; corolla purple or purple-tinged. 

 Leaflets broadly obovate; corolla 8-10 mm. long. 

 Leaflets oblong or elliptic; corolla about 12 mm. long. 

 Plant white-woolly; corolla ochroleucous. 



Calyx-teeth as long as the tube; leaflets acute or obtuse. 

 Calyx-teeth shorter than the tube; leaflets rounded at the apex. 



Banner distinctly longer than the wings; flowers spreading; leaflets not 

 retuse at the apex. 

 Calyx-teeth subulate, fully half as long as the tube; pods 2-2.5 cm. 



long, not densely crowded. 

 Calyx-teeth deltoid, one-fourth as long as the tube ; pods 3.5-4 cm. 

 long, densely crowded in headlike clusters. 

 Banner scarcely longer than the wings; flowers reflexed-drooping, at 

 least the lower ones; leaflets retuse at the apex. 



One species. 



One species. 



13. Lutosae 



14. Serpentes 



15. Polar es 



40. P. pomonensis. 



41. P. virgata. 



42. P. franciscana. 



43. P. candidissima. 



44. P. nivea. 



45. P. macrodon. 



46. P. miguelensis . 



47. P. veslila. 

 38. P. unde. 



48. P. lulosa. 



49. P. serpens. 



One species. 50. P. polaris. 



16. Candolleanae 

 Pod glabrous. 



Plant glabrous or nearly so; pod mottled. 51. P. Wardii. 



Plant hirsute-strigose ; pod not mottled. 52. P. Candolleana. 



Pod pubescent at least when young. 

 Leaflets linear to oblong. 



Calyx-lobes lanceolate, at least one half as long as the tube. 



Peduncles much exceeding the leaves. 37. P. piscina. 



Peduncles not exceeding the leaves. 

 Pod 2-3 cm. long. 



Corolla pink or whitish, tinged with purple; pod ellipsoid. 53. P. Wootoni. 

 Corolla dark -purple; pod obliquely ellipsoid. 55. P. Pondii. 



Pod 1-1.5 cm. long. 54. P. Tracyi. 



Calyx lobes deltoid, about one fourth as long as the tube; plant 



canescent. 56. P. subcinerea. 



Leaflets broadly oblong to oval or obovate, often retuse, villous. 



Pod convex-arcuate on both sutures; racemes longer than the leaves. 

 Leaflets pubescent on both sides; calyx and pod with spreading 

 hairs. 

 Stems simple; pod deeply sulcate on the lower suture. 57. P. Silerana. 



Stems much branched; pod not deeply sulcate. 



Plant green; calyx-lobes about equaling the tube; pod not 



mottled. 58. P. cerussata. 



Plant canescent; calyx-lobes decidedly longer than the tube; 



pod mottled. 59. P. pardalina. 



Leaflets glabrous above; calyx and pod appressed-pubescent. 60. P. zacatecana. 



Pod straight on the upper suture; racemes very short. 61. P. diurna. 



17. Annuae 

 Pubescence of the pod appressed or none. 



Racemes rather few-flowered, barely equaling the leaves. 

 Pod sparingly strigose or glabrous. 



Leaflets obovate or cuneate; plant perennial. 61. P. diurna. 



Leaflets linear to elliptic; plant annual. 



Corolla ochroleucous; pod 2 cm. long or more, the upper suture 

 curved upward. 

 Pod not sulcate on the lower suture; leaflets linear or linear- 

 oblong. 62. P. annua. 

 Pod sulcate on the lower suture; leaflets elliptic or oblong, 



retuse. 63. P. triquetra. 



