PEA FAMILY 459 



V. SULPHUREI. 



Flowers 12-14 mm. long; uoper lip of calyx about 8 mm. long. 21 L flavescens 

 Flowers 1 cm. long or less; upper lip of calyx very short, only 4 mm long 



Inflorescence loosely pubescent; flowers about 10 mm. long. 22. L sulphur eus 

 Inflorescence finely appressed-silky; flowers about 8 mm. long. 



23. L. lucidulus. 

 VI. ALBICAULES. 



One species. 24. L. albicaulis. 



VII. FOLIOSI. 



Flowers about 15 mm. long; pubescence long, sparse. 11. L. alpestris 



Flowers 8-12 mm. long; pubescence short. 

 Banner glabrous. 



Bracts linear-subulate, long-attenuate, 8-12 mm. long, longer than the buds 

 Flowers dark blue, ascending, in lax racemes; calyx appressed-silky. 



25. L. adscendens. 

 Flowers white in dense racemes, spreading; calyx with spreading hairs. 



26. L. ingratus. 

 Bracts lanceolate, short-acuminate, 4-7 mm. long; flowers spreading- calyx with 



short spreading hairs. 

 Flowers dark blue or dark purple; stems simple, low, 1-3 dm. high from a 



cespitose caudex. 



Pubescence of the stem and leaves short. 27. L. Macounii 



Pubescence of the stem and leaves rather long. 70. L monticola 

 Flowers lilac or rose-colored, rarely white; plant tall, 3-8 dm. high, branched. 



28. L.foliosus. 

 Banner more or less pubescent. 



Corolla light blue or lilac, 7-8 mm. long; keel glabrous. 29. L. laxus. 

 Corolla 8-10 mm. long; keel ciliate on the margins. 



Corolla dark blue or purple; stems mostly simple. 30. L. pulcherrimus. 

 Corolla light blue, or lilac, or pink ; stem much branched. 



8. L. argenteus. 



VIII. ORNATI. 



Bracts subulate, much longer than the flower-buds. 31. L. flexuosus. 



Bracts ovate or lanceolate, rarely exceeding the flower-buds. 

 Flowers less than 12 mm. long. 



Flowers 6-7 mm. long. 32. L. tenuispicus. 



Flowers 8-10 mm. long. 33. L. Greenei. 



Flowers over 12 mm. long. 



Stem few-leaved, only slightly exceeding the long petioles of the basal leaves. 

 Pubescence of the leaves long and rather loose, hirsute rather than silky. 



34. L. Rydbergii. 

 Pubescence of the leaves fine and short, strictly appressed and silky. 



Pubescence of the calyx and pedicels short, loose and spreading. 



35. L. humicola. 

 Pubescence of the calyx and pedicel densely and finely appressed-pubes- 



cent, silky. 36. L. Hellerae. 



Stems very leafy, many times exceeding the basal leaves. 



Flowers 15-20 mm. long; pubescence at least on the inflorescence brownish 



in age. 37. L. ornatus. 



Flowers 10-14 mm long; pubescence white-silky. 38. L. leucopsis. 



IX. CYTISOIDES. 



Stem arachnoid- villous ; flowers 18-20 mm. long. 39. L. nootkatensis. 



Stem sparingly hairy or glabrous; flowers 10-15 mm. long. 

 Stem decidedly pubescent with long spreading hairs. 



Banner only slightly shorter than the wings; plant 2-7 dm. high. 



40. L. Wyethii. 

 Banner much shorter than the wings; plant about 10 dm. high. 



Racemes dense; flowers about 12 mm. long, dark blue, verticillate, leaflets 



oblanceolate, long-hairy beneath. 41. L. amplus. 



Racemes lax; flowers about 10 mm. long, light blue or white, mostly singly; 

 leaflets narrowly oblanceolate, short-hairy beneath. 



42. L. marianus. 

 Stem glabrous or nearly so. 



Calyx and bracts villous. 43. L. Burkei. 



Calyx and bracts appressed-silky. 44. L. cytisoides. 



X. POLYPHYLLI. 



Stem decidedly hairy; leaflets oblanceolate. 45. L. glabratus. 



Stem glabrous or nearly so; leaflets narrowly oblanceolate. 46. L. polyphyllus. 



XI. AMMOPHILI. 



Keel ciliate on the margins ; leaves rather thick. 47. L. ammophilus. 



Keel glabrous; leaves thin. 45. L. glabratus. 



XII. CYANEI. 



Pubescence of the stem long; leaves greener. 48. L. comatus. 



Pubescence rather short, leaves canescent or silvery. 



