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. YELrtow Woop. 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. 
VII. SOPHORA L. 
Shrubby or herbaceous perennials. Leaves odd-pinnate, with 
many leaflets. Calyx bell-shaped, with 5 short teeth. Standard 
roundish ; kee! nearly straight. Stamens almost or quite dis- 
tinct; anthcors 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, 1-1 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 a 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 
sinall. 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 
