Hedysareae.^ LEGUMINOSAE. 275 



Anthers dimorphous; keel petals cohering in a beak : 



Pod flattened; flowers solitary in the leaf -axils... 2. Heylandia. 

 Pod turgid ; flowers in terminal or leaf -opposed racemes 



3. Grotalaria. 

 Stamens combined in a closed tube : 



Thorny bush ; calyx 2-lipped, the upper 2- the lower 3-lobed 



Ulex. 



Erect shrubs ; calyx with 2 upper lobes connate or free, 3 lower 

 connate Cytisus. 



Tribe II. TRIFOLIEAE. Herbs; leaves 3-foliolate, the 

 usually toothed; stamens diadelphons; pod usually d<'his< : 

 jointed : 



Leaves digitately trifoliolate : - 



Petals persistent, adnalc to the staminal tube; pod minut<>, 



indehiscent 4. Trifolium. 



Petals caducous, free from the staminal tube ; pod linear, 2- 



valved 5. Parochetus . 



Leaves pinnately trifoliolate : 



Racemes long; pod short, globose or ovoid 6. Melilotus. 



Ilacemes short : 



Pod straight or curved Trigonella. 



Pod spirally twisted Medicago. 



Tribe III. GALEGE AE. Herbs or shrubs ; leaves imparipinnate, 

 leaflets entire ; stamens usually diadelphous ; pod usually dehiscent, 

 or if indehiscent usually small, 1-2-seeded or membranous-inflated : 

 Anthers apiculate ; hairs fixed by the centre : 



Stamens monadelphous, the staminal sheath tubular ; leaflets 3, 



large, toothed 7. Cyamopsis. 



Stamens diadelphous, the vexillary one free; leaves simple, 

 digitate or pinnate, the leaflets usually small, entire 



8. Indigofera. 

 Anthers obtuse ; hairs basifixed : 



Pod indehiscent, 1-seeded; leaves gland-dotted 9. Psoralea. 



Pod many-seeded ; leaves rarely gland-dotted : 

 Inflorescence terminal or leaf-opposed : 



Alternate filaments dilated 10. Mundulea. 



Filaments not dilated: 



Leaflets parallel-nerved 11. Tephrosia. 



Leaflets with netted venation 12. Millettia. 



Inflorescence axillary; pod long, septate 13. Sesbania. 



Tribe IY. HEDYSAREAE. Herbs or shrubs, sometimes twining or 



