POLYPETALOL'S EXOGENOL'S PLANTS. 2oi 



ERYTHRINA, L. 



Calyx tubular-campanulate, truncate, toothless; vexil- 

 lum narrow, straight, elongated ; keel and wings very 

 small ; stamens and stijle partly exserted ; legxime stipitate, 

 torulose, partly dehiscent.— 2Vee5, shrubs, or rarely herbs, 

 ofcen armed with prickles; leaves trifoliolate, the terminal 

 leaflet long-petiolulate ; flowers showy, scarlet, in long 

 racemes. 



E. HERBACEA, L. Stems herbaceous, several from a 

 very thick root, prickly, the flowering ones mostly leafless; 

 leaves long-petioled ; leaflets ovate or somewhat hastate ; 

 vexilhim lanceolate, folded ; seeds scarlet. Stems 2°-4° 

 high ; racemes l°-2° long ; flowers 2' long ; legume open- 

 ing by one suture opposite the seeds. 



CLITORIA, L. 



Calyx tubular, 5-toothed ; vexillum very large, spurless 

 on the back, obovate, emarginate ; heel shorter than the 

 wings ; stamens monadelphous below ; style curved, hairy ; 

 legume stipitate, linear-oblong, torulose, veinless. — Peren- 

 nial herbs, with trifoliolate leaves, and very large purple 

 flowers on axillary peduncles ; bracts opposite. 



C. Mariana, L. Smooth ; stem erect or twining ; leaf- 

 lets ovate-oblong, pale beneath ; pechincles shorter than the 

 leaves, 1-3-flowered ; legume 3-4-seeded. Stem l°-3° long ; 

 floivers %' long, pale purple ; bracts shorter than the 

 calyx ; legume 1 J'-2' long. 



CENTROSEMA, DC. 



Calyx short, 5-cleft, tlie two upper lobes more or less 

 united ; vexillum very large, spurred on the back, orbicu- 

 lar, emarginate; heel nearly as long as wings; stamens 



