STANDLEY TEEES AND SHRUBS OF MEXICO. 447 



Leaflets 7 to 9 mm. long ; corolla more than 1 cm. long. 



38. P. diversicolor. 

 Calyx with a row of conspicuous glands bet^veen the ribs ; leaves usually 

 more or less pubescent. 

 Calyx glabrous only at the base, more or less pilose between the ribs 

 as well as on the margin. 



Bracts caudate-acuminate, longer than the calyx 39. P. caudata. 



Bracts acute or short-acuminate, shorter than the calyx. 



Corolla 10 mm. long; bracts pubescent 40. P. lutea. 



Corolla 7 mm. long; bracts glabrous on the baclv__41. P. wardii. 

 Calyx wholly glabrous except on the margins. 

 Leaves glabrous. 



Stems glabrous 42. P. argyrostachya. 



Stems puberulent 43. P. botterii. 



Leaves pubescent. 

 Bracts acute or gradually short-acuminate. 



Leaflets elliptic-obovate, pubescent on both sides. 



44. P. plumosa. 

 Leaflets oblong, glabrous on the upper surface. 



45. P. painteri. 

 Bracts abruptly caudate-acuminate. 



Petals dark blue 46. P. atrocyanea. 



Petals yellow. 



Leaflets hairy on both sides ; stem long-hairy. 



47. P. gigantea. 

 Leaflets glabrate on the upper surface ; stem short-hairy. 



48. P. macrostachya. 

 CC. Petals purple or bluish to white, only the banner, if any of the 

 petals, ochroleucous. 

 D. Leaves glabrous. 

 Leaflets 41 to 71. 



Leaflets oblong, channeled. Calyx lobes longer than the tube. 



49. P. crassifolia. 

 Leaflets oval, flat. 



Bracts much longer than the calyx ; calyx lobes equaling the 



tube 50. P. roseiflora. 



Bracts not exceeding the calyx ; calyx lobes shorter than the 



tube 51. P. longifolia. 



Leaflets 7 to 31. 



Spikes short and dense, subcapitate, subsessile. 



Spikes many-flowered ; calyx lobes about equaling the tube. 



52. P. saffordii. 

 Spikes few-flowered ; calyx lobes much longer than the tube. 



Bracts glabrous : calyx lobes about 6 mm. long. 



53. P. formosa. 

 Bracts silky-pilose ; calyx lobes 3.5 to 4 mm. long. 



54. P. purpusi. 

 Spikes elongate, distinctly pedunculate. 



Calyx tube glabrous or nearly so 43. P. botterii. 



Calyx tube densely pubescent. 



Branches conspicuously gland-dotted 55. P. brandegei. 



Branches not conspicuously gland-dotted. 



Leaflets broadly oblong: calyx lobes shorter than the tube. 



56. P. smithii. 



