314 LEGUMINOS^:. 



monadelphous, dimorphous, 5 with longer and basifixed anthers, the 

 alternate 5 with shorter and versatile ones. Pod somewhat flattened, 

 often constricted between the seeds. Cot3^1edons thick and fleshy. 

 (Latin lupus a wolf, these plants thought to rob .the soil of its 

 fertility.) 



A. Pods linear or oblong. 



Bracts deciduous ; ovules several; cotyledons of the seedling petioled. 

 Low shrubs or at least sufErutescent, silky pubescent; petioles mostly 

 short. 

 Flowers sulphur-yellow; raceme often 1 ft. long. . 1. L. arboreus. 



Flowers not yellow, mostly blue. 

 Herbage greenish; flowers blue or white; keel ciliate for its whole 



length; low, the stems merely suffrutescent. . . 2. L. variicolor. 

 Herbage silky. 

 Flowers bluish or lavender, the banner with a yellow spot; keel 



glabrous; no distinct trunk S. L. Chamissonia. 



Flowers blue; keel ciliate; shrub with a distinct trunk 



4. L. albifrons. 

 Perennial herbs. 

 Leaflets 5 to 7, more or less ciliate or ciliolate. 

 Herbage canescently silky. 

 Leaflets oblanceolateorcuneate-oblong; roots large, yellow; seashore 



sipecies 5. X. Uttoralis. 



Leaflets spatulate-oblong; root not yellow; montane species . . . 



6. L. sericatus. 

 Herbage greenish, comparatively glabrous ; montane or of the hills . 



7. L. latifolius. 

 Leaflets 7 to 9, linear-lanceolate, 1 to IJ^ in. long; keel glabrous; plants 



mostly decumbent, with silky herbage 8. L. formosus. 



Leaflets 9 to 16, lanceolate or oblanceolate, 3 to 6 in. long; petioles }4 ^^• 



long or more; plants erect, 3 to 5 ft. high, sparingly villous 



9. L. polyphyllus. 

 Annual herbs. 

 Flowers mostly 4 to 7 lines long; upper calyx-lip cleft or bifld. 

 Lower calyx-lip 3-toothed or entire; leaflets cuneate-obovate, obtuse or 



emargmate; plants very stout and succulent . . 10. L. a;Sinis. 

 Lower calyx-lip 3-dentate ; leaflets oblanceolate, acute, plant slender, 



not succulent . .11. L. nanus. 



Flowers mostly 13^ to 3 lines long. 

 Slender plants; upper calyx-lip with divergent lobes. 

 Lower calyx-lip long, entire. . . . . 12. X. micranthus. 



Lower calyx-lip deeply 3-cleft 13. X. trifidus. 



Stoutish plants; upper calyx-lip bifid, the ovate segments short and 



parallel; lower calyx-lip entire or slightly dentate 



14. X. polycarpus. 



B. Pods short and roundish or ovate. 



Bracts persistent; ovules 2; cotyledons of the seedling broad and united by 

 their bases; annuals. 

 Upper lip of calyx herbaceous and entire; flowers pale yellow; stems 



simple below, widely branching above 15. X*. luteolus. 



Upper lip of calyx more or less scarious, emarginate or cleft. 

 Flowers commonly white or yellow; stem simple below, branching at 



the middle 16. X. densifiorus. 



Flowers light purple or flesh-color ; stem commonly simple 



17. X. microcarpus. 



1. L. arboreus Sims. Distinctly arborescent and 4 to 8 ft. high 

 or lower and merely suff'rutescent; lightly pubescent on the young 

 stems and lower surface of the leaves; leaflets oblanceolate, 1 to 2^ in. 

 long, 9 to 11 on the first leaves, 6 to 8 on the (later) leaves from the 



