132 KEY AND FLORA 



Flowers creamy-white, in long, drooping panicles. Calyx 5- 

 toothed. Standard large, nearly round, reflexed ; petals of the 

 keel and wings separate and straight. Stamens 10, uncon- 

 nected with each other. Pod borne on a short stalk above the 

 calyx. Seeds 4-6. 



1. C. lutea Koch. YELLOW WOOD. Tree 50 ft. or less in height, 

 much branched, with a round, spreading top. Hillsides, in fertile 

 soil, south central states. Also considerably planted as a shade tree. 



VIII. SOPHORA L. 



Shrubby or herbaceous perennials. Leaves odd-pinnate, with 

 many leaflets. Calyx bell-shaped, with 5 short teeth. Standard 

 roundish ; keel nearly straight. Stamens almost or quite dis- 

 tinct ; anthers versatile. Pod stalked, leathery or fleshy, nearly 

 cylindrical but more or less contracted between the seeds, not 

 splitting open. 



1. S. sericea Nutt. Herbaceous with a woody base, erect, 6-12 

 in. high, covered with silky silvery down. Leaflets 7-25, obovate or 

 nearly so, obtuse, narrowed at the base, *-| in. long. Flowers white. 

 Pod slender, dry, few-seeded. Prairies W. and S.W. 



IX. LUPINUS L. 



Biennial or perennial herbs. Leaves simple or palmately 

 compound. Flowers showy, in terminal racemes. Calyx 

 2-lipped, 5-toothed. Standard round, with the sides reflexed ; 

 keel scythe-shaped. Stamens monadelphous ; anthers alter- 

 nately oblong and roundish. Ovary sessile ; matured pod 

 oblong, several-seeded, often compressed between the seeds.* 



1. L. perennis L. Perennial. Stem erect, downy, 12-18 in. high. 

 Leaves palmately 7-9-foliate ; leaflets obovate or oblanceolate, obtuse 

 and mucronate at the apex, slightly downy ; petiole slender ; stipules 

 small. Racemes terminal, slender, loosely many-flowered. Flowers 

 purple, blue, pink, or white. Pod oblong, densely downy, few-seeded. 

 Dry, sandy soil.* 



X. LABURNUM Medic. 



Trees or shrubs. Leaves of 3 leaflets, with very small 

 stipules or none. Flowers golden-yellow, in slender, drooping 

 racemes. Calyx 2-lipped, the upper lip 2-toothed, the lower 

 3-toothed. Standard ovate, upright, of the same length as the 



