POLYPETALOUS EXOGENOUS PLANTS. 225 



purple; stem l°-2° high from long and slender roots; 

 'flowers showy. 



** Flowers in long-peduncled racemes opposite the leaves ; vexUlum pubescent ex- 



ternoMy. 



T. SPICATA, Torr. and Gray. Hirsute or villous with 

 rusty hairs; stems simple or diffusely branched; leaves 

 scattered, short-petioled; leaflets 9-15, oval or cuneate ob- 

 long, rounded and strongly mucronate at the apex, smooth- 

 ish above ; racemes 2-3 tinies as long as the leaves, 6-10- 

 flowered; lobes of the calyx linear-subulate; flowers large, 

 white and purple; stems l°-2° long. 



T. HISPIDULA, Pursh. Hoary-pubescent or smoothish ; 

 stems slender, terete, erect or procumbent ; petiole shorter 

 than the lowest leaflets ; leaflets 11-15, small (4"-6" long), 

 oblong, acute or obtuse, often smooth above; peduncles 

 slender, terete, commonly longer than the leaves, 2-4-flow- 

 ered ; flowers small, purple ; stems 6-18' long. 



INDIGOFERA, L. Indigo. 



Calyx 5-cleft; vexillum roundish; ^eeZ with a subulate 

 spur on each side, often elastically reflexed; stamens di\2i- 

 delphous (9 and 1) ; legume 1-many-seeded ; seeds usually 

 truncated at each end, often separated by membranaceous 

 partitions. — Herbs, with unequally pinnate leaves, and 

 white, brownish, or purplish axillary flowers; legumes 

 drooping. 



* Racemes longer than the leaves. 



I. Caroliniana, Walt. Smoothish; stem erect, tall, 

 branching ; leaflets 10-15, obovate or oblong ; racemes 

 many-flowered ; calyx-te^ih. short, acute ; floiuers yellowish- 

 brown; legume oblong, veiny, 2-seeded ; stem 3°-5° high ; 

 flowers small; legume 4"-5" long. 



I. LEPTOSEPALA, Nutt. Rough hairy ; stem decumbent ; 

 10* 



