460 



FABACEAE 



Pubescence of the leaves appressed. 



Corolla blue; banner with a light spot. 



Bracts linear-lanceolate to subulate, 5-8 mm. long. 



Corolla 12-14 mm. long; leaflets 3-7 cm. long. 49. L. sericeus. 

 Corolla 10 mm. long or less; leaflets 2-3 cm. long. 50. L. apronosus. 

 Bracts lanceolate, 3-5 mm. long. 



Leaflets densely pubescent above; corolla about 12 mm. long. 



51. L. Bakeri. 



Leaves sparingly pubescent or glabrate above; corolla about 10 mm. long. 



52. L. cyanens. 

 Corolla at first white; banner turning purplish; no light spot. 



53. L. dichrous. 

 Pubescence of the leaves long and loose; corolla light purple or pink; banner with a 



dark spot. 54. L. ftavicaulis. 



XIII. LEUCOPHYLLI. 



Racemes elongate, 1-3 dm. long, terminal. 



Flowers numerous hi a very long and dense raceme. 

 Bracts lanceolate, not much longer than the buds. 

 Pubescence not very dense. 



Pubescence on the leaves appressed. 55. L. macrostachys. 



Pubescence on the leaves shoit, spreading. 56. L. retrorsus. 



Pubescence very dense, in age more or less rusty, and rather loose. 



57. L. leucophyllus. 



Bracts subulate, much exceeding the buds; flowers about 16 mm. long. 

 Pubescence of the leaves long and loose. 58. L plumosus. 



Pubescence of the leaves short, appressed. 59. L. Jonesii. 



Flowers in a long, but lax raceme. 60. L. bar big er. 



Racemes short, 3-5 cm. long, terminating short divaricate branches. 



61. L. ramosus. 



XIV. LEPIDI. 



Stem trailing or decumbent. 62. L. depressus. 



Stem erect or ascending, if at all decumbent, only so at the base. 



Pubescence of the stem and leaves loose. 63. L. aridus. 



Pubescence of the stem and leaves appressed. 



Flowers 7-10 mm. long; stem mostly 1-leaved or leafless; pubescence short. 

 Racemes short, dense, 2-5 cm. long; flowers about 10 long. 



64. L. minimus. 

 Racemes elongate, 8-9 cm. long; flowers 7-8 mm. long. 



65. L. erectus. 

 Flowers 12 mm. long or more; stem with several stem-leaves; pubescence long. 



66. L. lepidus. 



XV. CANDICANTES. 



Flowers 9-10 mm. long or more. 



Peduncles short; raceme elongate. 67. L. psoralioides. 



Peduncles elongate; racemes short. 68. L. candicans. 



Flowers 6-7 mm. long. 69. L. Evermannii. 



XVI. MONTICOLAE. 



Flowers 9-10 mm. long; petals dark blue; banner with a light spot. 



70. L. monticola. 

 Flowers 7-8 mm. long; petals light rose, turning yellowish. 71. L. roseolus. 



XVII. CAESPITOSI. 



Plant loosely pubescent with long hairs. 



Racemes very short and dense, sessile; bracts lanceolate, about equalling the flowers; 



pubescence rather appressed. 72. L. caespitosus : 



Racemes elongate; bracts subulate, exceeding the flowers; pubescence spreading. 



73. L. Watsonii. 

 Plant densely canescent. 74. L. Cusickii. 



One species. 



XVIII. CONCINNI. 



75. L. micensis. 



XIX. PUSILLI. 



Racemes dense, subcapitate; lower lip of the calyx 2-3-toothed. 



Plant almost stemless; lower lip of the calyx oval or ovate. 76. L. brevicaulis. 

 Plant with distinct leafy stem; lower lip of the calyx oblong-lanceelate. 



77. L. Kingii. 

 Racemes more elongate and less dense; lower lip of the calyx entire. 



Peduncles much exceeding the leaves. 78. L. scaposus. 



Peduncles very short, shorter than the petioles. 



Racemes lax, usually much exceeding the leaves; lower part of the calyx and 



pedicels glabrous. 79. L. rubens. 



Racemes dense, slightly if at all exceeding the leaves; calyx and pedicels densely 

 hirsute. . 80. L. pusillus. 



1. L. plattensis S. Wats. Stem short, densely leafy, 2-5 dm. high; leaf- 

 lets 7-9, oblanceolate, obtuse or acutish, thick, somewhat glaucous, grayish 

 silky-strigose beneath, 2-4 cm. long; racemes 1-1.5 dm. long; bracts lanceolate, 



