Papilionacece.] XXXI. LEGUMINOS^. 131 



lip consisting of 2, the lower (anterior) of 3 sepals. Petals 5, clawed, un- 

 equal, imbricate in bud, the posterior and outside petal (standard) broad ; 

 often reflexed, the 2 anterior and inside petals (keel) often connate, the 

 2 lateral and intermediate petals (wings) enclosing the keel. (The stan- 

 dard is often called the upper petal, being commonly placed upwards with 

 regard to the axis of the inflorescence, but as regards insertion it is the 

 lowest of the 5 petals.) Stamens generally 10, inserted with the petals 

 near the base or on the inside of the calyx-tube ; filaments free, or con- 

 nate into a tube or sheath, or the one opposite to the standard free, the 

 claws of keel, or of keel and wings, sometimes adhering to the staminal 

 tube; anthers versatile, rarely basifixed. Pistil monocarpeUary, sessile 

 or stipitate ; style incurved ; stigma oblique or terminal ; ovules numerous, 

 rarely 1 or few. Fruit a dry legume. Seeds with a coriaceous testa, 

 without albumen; cotyledons thick, plano-convex; the radicle accum- 

 bent upon the cotyledons. 



The 20 genera here described belong to the following tribes : — 

 PodalyriecB. — Stamens 10, free ; leaves simple or digitate — Piptanthus. 

 GenisteoB. — Stamens 10, monadelphous ; leaves simple or digitate — Crota- 



laria. 

 GalegecB. — Stamens 10, diadelphous; pod 2-valved; leaves imparipinnate 



— Caragana, Indigofera, Colutea', Seshania, Millettia. 

 Hedysarem. — Stamens 9 or 10 ; pod articulate ; leaves pinnate or trifolio- 



late — Alliagi, Desmodium, Ougeinia. 

 Videee. — Stamens generally 10, diadelphous, pod 2-valved; leaves abruptly 



pinnate — A hrus. 

 Pliaseoleoe. — Stamens 10, monadelphous or diadelphous ; pods 2-valved; 



leaves imparipinnate ; leaflets mostly 3 — Erythrina, Pueraria, Bntea, 



Spatkolobus. 

 Dalbergiece. — Stamens 10, monadelphous, or in 2 bundles; pod indehis- 



cent ; leaves imparipinnate — Dalbergia, Pterocarpiis, Pongamia, 



Derris. 

 Sqphorece. — Stamens 10, free ; leaves imparipinnate — Sophora. 



Stamens free. 

 Pod flat, 2-valved; stipules connate, opposite to petiole . 1. Piptanthits. • 

 Pod moniliform, generally indehiscent ; stipules distinct . 2. Sophora. 

 Stamens monadelpEous, or equally diadelphous, or unequally 

 diadelphous (the tenth stamen free). 

 Pod 2-valved ; leaves pinnate, rarely trifoliolate or simple. 

 Spinescent shruhs ; flowers solitary or in few-flowered 



umbels 3. Caraqana. 



Unarmed shrubs ; flowers racemose. 

 Flowers pink, purple, or white ; pods not inflated . 4. Imdigofera. 



Flowers yellow ; pods inflated 5. Coldtea. 



Soft-wooded trees, with large flowers ; leaflets numerous . 6. Sesbania. 

 Climbers with flat pods. 

 Leaves imparipinnate ; seeds compressed ... 7. Millettia. 

 Leaves abruptly pinnate ; seeds subglobose ... 8. Abeus. 

 Pod 2-valved ; leaves trifoliolate. 

 Pod 1-10-seeded. 

 Trees with bright red flowers 9. Eetthbina. 



