PEA FAMILY 485 



I. Calcarati. 



Wing-petals rather densely pubescent on outer surface near upper distal corner, or calyx-cup distinctly spurred, 



banner long-clawed, and upper calyx-lip much exposed. 30. L. laxiflorus. 



Wing-petals not pubescent near upper distal corner, though sometimes with a few scattered villi on the outer 

 surface near claws. 

 Leaflets glabrous or glabrate above. 



Stems without long-petioled lower leaves at flowering time. 

 Stems much branched above. 

 Stems simple or nearly so. 

 Stems with some long-petioled lower leaves at flowering time. 

 Keel non-ciliate. 



Stems not fistulous; flowers scattered or subverticillate. 

 Stems fistulous; flowers in crowded verticils. 

 Keel ciliate. 



Keel arcuate. 

 Keel nearly straight. 

 Leaflets permanently pubescent above. 



Stems without long-petioled lower leaves at flowering time; pedicels sprea 



calyx-cup short-spurred or strongly gibbous. 

 Stems with some long-petioled lower leaves at flowering time. 

 Calyx-cup strongly gibbous or spurred. 

 Calyx-cup scarcely gibbous. 

 Flowers 7-10 mm. long. 



Lower leaves long-petioled. 

 All leaves short-petioled. 

 Flowers 10-14 mm. long. 



Banner more or less pubescent on the back; petals usually pale yellow, rarely blue. 



35. L. sulphureus. 



Banner glabrous, or with very few scattered hairs; petals blue, purplish, pinkish, or white. 

 Pubescence, at least below the inflorescence, mostly appressed, if spreading (var. 

 mollis) the keel not ciliate. 36. L. leucopsis. 



Pubescence largely spreading, keel strongly ciliate on the upper edges. 



37. L. nevadensis. 



J. Breweriani. 

 A single polymorphic species. 44 - L - Breweri. 



K. Leucophylli. 



Floral bracts caducous; pubescence very dense and closely appressed. 45. L. Peirsonii. 



Floral bracts mostly persistent; pubescence woolly-canescent or short-villous. 46. L. leucophyllus. 



L. Sericei. 



Low alpine dwarfs, scarcely 1 dm. tall; leaves crowded basally; peduncles scapose; flowers 11-12 mm. long; 

 racemes subcapitate. 

 Pubescence loosely ascending. 44. L. Breweri var. 



Pubescence closely appressed. 49. L. lapidicola. 



Plants 2-15 dm. tall. 



Keel narrow, with long slender acumen and narrowed toward the claws. 



Keel non-ciliate or with 1-5 scattered cilia; longest petioles about 2 cm. long, about equaling the leaflets. 



47. L. Channssonis. 



Keel ciliate along upper edges of acumen, or lower petioles much longer than their leaflets. 



48. L. altnfrons. 



Keel broader, not narrowed toward the base, usually ciliate along more or less of the upper edges. 

 Upper leaves short-petioled. 



Pedicels appressed-pubescent. 



Pubescence dense, usually silvery or satiny; banner glabrous or more or less silky on the back. 



50. L. ornatus. 



Pubescence thin, leaves distinctly green; banner usually sparsely silky on the back. 



51. L. alpicola. 



Pedicels spreading-pubescent. 



Banner pubescent on the back. 



With a few long-petioled lower leaves at flowering time; upper calyx-lip bidentate. 



52. L. sericeus. 



With no long-petioled leaves at flowering time; upper calyx-lip bifid. 



53. L. Abramsu. 



Banner normally glabrous. 



Flowers 11-14 mm. long; keel sparsely ciliate on the upper edges; petals largely blue. 



54. L. Suksdorfix. 



Flowers 15-18 mm. long; keel densely ciliate on the upper edges; petals bright yellow, or 

 rarely bluish. 55. L. Sabtntt. 



Most or all of the leaves long-petioled. 

 Stems and petioles appressed-silky. 



Largest leaflets not over 12 mm. wide. 56 - L - excubitus. 



Largest leaflets 15-30 mm. wide. 57. L. sericatus. 



Stems and petioles with widely spreading hairs. 



Largest leaflets 15-30 mm. wide. S8 - L - cervinus. 



Largest leaflets not over 12 mm. wide. 



Leaflets oblanceolate; pubescence more downy than woolly; racemes 10-15 cm. long. 



59. L. Grayi. 



Leaflets cuneate or spatulate; pubescence distinctly woolly; racemes 15-20 cm. long. 



60. L. ludoincianus. 



