PULSE FAMILY 133 



straight wings. Stamens cliadelphous (9 and 1). Ovary and 

 pod somewhat stalked above the calyx, several-seeded. 



1. L. vulgare Griseb. Laburnum, Golden Chain. A small tree, 

 with smooth, greenish bark. Leaves with slender petioles; leaflets 

 oblong-ovate, acute at the base, taper-pointed, downy beneath. 

 Flowers showy, in graceful racemes. Cultivated from Europe. 



XI. CYTISUS L. 



Shrubs, rarely spiny. Leaves of 1-3 leaflets or none ; stipules 

 very small. Calyx 2-lipped, the upper lip slightly 2-toothed, 

 the lower 3-toothed. Keel straight or a little curved, blunt, 

 turned down after flowering. Stamens with their filaments 

 all united ; anthers every other one short and attached by its 

 center, the alternate ones long and fastened by their bases. 

 Style curved in, or, after the flower opens, coiled up. Pod 

 flat, long, many-seeded. 



1. C. canariensis Dumont. A shrub with many rather stiff, erect, 

 slender branches. Leaves abundant, very small, covered with soft 

 gray hairs; leaflets 3, obovate. Flowers rather small, yellow, in 

 somewhat erect racemes. Cultivated in greenhouses. From the 

 Canary Islands. 



XII. TRIFOLIUM L. 



Annual, biennial, or perennial herbs. Stems more or less 

 spreading. Leaves petioled, of 3 toothed or serrate leaflets ; 

 stipules united to the petioles. Flowers white, yellow^, or red, 

 in heads. Calyx 5-cleft, the teeth nearly equal, awd-shaped. 

 Petals withering-persistent ; keel shorter than the wings. Sta- 

 mens diadelphous. Pod smooth, 1-6-seeded, scarcely opening.* 



1. T. arvense L. Rabbit Foot Clover, Stone Clover. Annual, 

 silky-downy, erect, branching, 5-10 in. high. Leaflets oblanceolate or 

 linear, minutely toothed above. Heads terminal, peduncled. Calyx 

 teeth very silky-hairy, longer than the whitisli corolla. Old fields, rail- 

 road embankments, and waste ground. Naturalized from Europe. 



2. T. incarnatum L. Crimson Clover. Annual. Stem erect, 

 somewhat branched, downy, 1-2 ft. high. Lower leaves long-petioled, 

 the upper short-petioled; leaflets obovate or wedge-shaped, toothed at 

 the apex. Flowers briglit crimson, sessile, in terminal heads which 

 finally become much elongated. Calyx silky, its lobes long and 

 plumose. Introduced from Europe and cultivated for fodder. 



