CL. XVII.] DIADELPHIA. 285 



CLASS XVII. DIADELPHIA. 



Filaments united, forming two sets. 



Order I. HEXANDRIA. Six Stamens. 



1. FUMA'RIA. Ca lyx of two leaves. Petals four, irregular. Each 



filament bearing three anthers. 



Order II. OCTANDRIA. Eight Stamens. 



2. POLY'GALA. Calyx of five leaves, the two inner much larger, 



coloured. Capsule two-celled, two-valved. 



Order III. DECANDRIA. Ten Stamens. 



* Stamens all united at the base, forming a tube which is generally split 

 along its upper side. 



3. GENl'STA. Calyx two-lipped, the upper lip with two teeth, the 



lower with three. Standard reflected. 



4. U'LEX. Calyx of two leaves, nearly as long as the legume. 



6. ANTHY'LLIS. Calyx inflated, five-toothed, inclosing the legume. 



5. ONO'NIS. Calyx with five deep segments. Standard striated. 



Legume turgid, sessile. 



** Stamens, nine united at the base, one free ; stigma or style downy. 



8. O'ROBUS. Style linear, nearly cylindrical. Stigma downy, linear, 



extending along the upper side of the style. 



7. PI'SUM. Style triangular. Stigma downy, extending along the 



prominent upper angle of the style. 



9. LATHYRUS. Style flattened, dilated upwards. Stigma downy, 



extending along the dilated part of the style. 



10. VI'CIA. Style bearded in front, below the stigma. 



11. E'RVUM. Stigma knobbed, downy all over. 



*** Stamens, nine united, one free; stigma not downy ; legume two-celled. 

 16. ASTRA'GALUS. Legume tumid, with two longitudinal cells. 



**** Stame7is, nine united, one free ; stigma not downy ; legume 

 one-celled, jointed. 



15. HEDY'SARUM. Legume of one or more compressed single-seeded 

 joints. Keel very obtuse. 



12. ORN1THOPTJS. Legume compressed, curved, of many close, 



single-seeded joints, whose sides are equal. 



13. ARTHROLO'BIUM. Legume cylindrical, curved, of many close, 



single-seeded joints, whose sides are equal. 



14. HIPPOCRE'PIS. Legume compressed, partly membranous, in- 



curved, with many curved joints ; one of the sutures with several 

 notches. 



***** Stamens, nine united, one free ; stigma not downy ; 



legume one-celled, not jointed. 



19. MEDICA'GO. Legume compressed, somewhat membranous, spi- 

 rally twisted. 



2 B 



