STANDLEY TREES AND SHRUBS OF MEXICO. 449 



Spikes subcapitate ; corolla fading yellow ; bracts persistent. 



Stems pubescent 73. P. capitata. 



Stems glabrous. 



Bracts brown, not conspicuously glandular ; pubescence of the 



calyx appressed 74. P. quinqueflora. 



Bracts yellow, with green tip, conspicuously glandular ; pubescence 



of the calyx not appressed 75. P. lloydii. 



Corolla (except sometimes the banner) not yellow. 

 Petals white. 



Calyx tube glabrous 76. P. mucronata. 



Calyx tube pubescent. 



Leaflets 3 to 5 mm. long, linear ; bracts persistent 77. P. lumholtzii. 



Leaflets more than 10 mm. long, oval or oblong ; bracts caducous. 

 Calyx lobes deltoid-acuminate, fully half as long as the tube; 



spikes paniculate, nodding 78. P. eysenhardtioides. 



Calyx lobes triangular, acute, one-third as long as the tube ; spikes 



mostly axillary, erect 79. P. leucostachys. 



Petals wholly or partly purple, pink, or blue. 



Calyx glabrous or sparssely silky-strigose outside, the lobes ciliolate, 

 broader than long. 



Calyx glabrous ; flowers sessile 80. P. frutescens. 



Calyx sericeous-strigose ; flowers short-pedicellate 81. P. hospes. 



Calyx pubescent outside, at least on the lobes, these longer than broad. 

 Leaflets large, 1 to 2 cm. long, acute ; corolla yellow at first. 



72. P. acutifolia. 

 Leaflets mostly small, sometimes large, nearly always obtuse ; wing 

 and keel petals always purple, pink, or blue. 

 Petals dark blue. 



Leaflets 2 to 4 mm. long, elliptic or oval 82. P. pilosissima. 



Leaflets 5 to 20 mm. long, or sometimes larger. 



Leaves simple 84. P. scoparia. 



Leaves pinnate. 



Calyx lobes unequal, the lowest one distinctly longer ; leaves 



glabrous 85. P. juncea. 



Calyx lobes subequal ; leaves sparsely or densely canescent. 



Leaflets entire or sinuate, oval to oblong 86. P. tinctoria. 



Leaflets distinctly dentate. 



Leaflets obovate to oblanceolate ; stem and leaves de- 

 cidedly canescent 87. P. dentata. 



Leaflets linear-lanceolate; stem and leaves somewhat 



pubescent but green 88. P. arenaria. 



Petals (except sometimes the banner) purple or pink. 

 Banner, as well as the other petals, pupple. 



Leaflets 13 to 31, oblong 62. P. oaxacana. 



Leaflets 31 to 65, linear. 



Leaves glabrous 89. P. pectinata. 



Leaves canescent 90. P. abietifolia. 



Banner yellow or white. 



Branches not conspicuously glandular-tuberculate. 

 Spikes .solitary ; leaflets glabrous, very numerous. 



51. P. longifolia, 

 Spikes paniculate; leaflets few, canescent. 



Petals purple 91. P. tomentosa. 



Petals pink, turning yellowish in age__92. P. psoraleoides. 



