LEGUHINOSJS. (PEA F\MILT.) 39 



* * Leaves unequally pinnate; leaflets entire; no tendril. 



Flowers umbellate or solitary, axillary Hosackia. 7 



Flowers white or pinkish. Pod short, prickly Glycyrrhiza. 10 



Pods mostly inflated or nearly 2-celled Astragalus. 11 



* * * Leaves terminated by a tendril or bristle or an imperfect leaflet. 



Style filiform, hairy around the apex Vicia. 12 



Style flattened dorsally toward the apex, hairy on the inner side, usually 



twisted half round Lathyrus. 13 



1. THERMOPSIS, R. Br. 



Calyx companulate, cleft to the middle. Standard roundish, shorter than the oblong 

 wings, the sides reflexed; keel nearly straight, its petals somewhat united, equalling tho 

 wings. Perennial herbs with the aspect of Lupine; leaflets entire; stipules foliaceous; 

 flowers large in long terminal racemes, with persistent bracts. 



1. T. Californica, Wat. Woolly -tomentose; stipules lanceolate; leaflets obovate to 

 oblanceolate, an inch or two long; bracts ovate; pod hairy. 



2. PICKBRINGIA, Nutt. 



Calyx campanulate, turbinate at the base, repandly 4-toothed. Petals equal; standard 

 orbicular, the sides reflexed; wings oblong; keel petals oblong, distinct, straight, obtuse. 

 A low stout much branched spinose shrub; leaves evergreen, small, nearly sessile, 

 1-3-foliolate, without stipules; flowers large, solitary, axillary, nearly sessile. 



1. P. montana, Nutt. Spreading, densely branched, 4 to 7 ft. high, silky-tomentoso 

 or smooth; leaflets 3 to 9 lines long; flowers from light cinnamon-red to purple, 7 to 9 

 lines long; stamens persistent. 



3. LTJPINUS, L. LUPINE. 



Calyx deeply bilabiate, bibracteolate. Standard broad, the sides reflexed; wings united 

 at the ends, enclosing the incurved beaked keel. Stipules adnatc to the petioles; leaflets 

 entire. Flowers in terminal racemes, verticillate or scattered, bractcate. 



A large and difficult genus. 



* Annuals. 



Ovules 2; bracts persistent; flowers in whorls; leaves long petioled, approximate; stout. 



Long-villous; flowers mostly purple L. microcarpus. 15 



Smoother; flowers yellow to white L. densiflorus. 16 



Ovules several; bracts deciduous; flowers in whorls; petioles 1 to 3 times the length of 

 the leaflets. 

 Puberulent; leaflets broad, smoother above; bracts short L. affinis. 8 



