80 BOTAKY. 



Psoralea. Perennial herbs, with 3-foliolate leaves and axillary spikes. 



Stamens moiiadelplious or somewhat diadelphous. l'od 1-seeded. 

 Amokimia. Shrnbs, with pinnate leaves and terminal racemes. Wings and 



keel wanting. Stamens united only at base. Pod 1-2 seeded. 

 PXTALOSTEMON. Herbs, with pinnate leaves and terminal spikes. Stamens 



5, uionadelphous, bearing 4 of the petals on the tube. Pod 1-seeded. 

 I'akkyella. Shrubby, with pinnate leaves and terminal spikes. Stamens 



10, distinct. Petals none. Pod 1 seeded. 

 Dalea. Shrubs or herbs, with pinnate leaves and terminal spikes or heads. 



Stameus 10, monadelpbous, the petals jointed to the tube. Pod 1-2 seeded. 

 1 1 1 Leaves pinnately 3-mauy foliolate (digitately 2-4-foliolate in Zornia) ; leaflets 



entire: pod transversely 2-several-jointed, the joints iudehisceutaud 1-seeded. 



Herbs. 

 Hedysarum. Leaflets several, stipellate; stipules scarious. Stamens dia- 



delphous. Perennial, with axillary racemes. 

 Zoknia. Leaflets 2 ; stipules herbaceous. Stamens monadelphous. Flowers 



spicate, each solitary and sessile between a pair of conspicuous bracts. 



Annual. 

 Desmodium. Leaflets 3 ; stipules dry and striate. Stamens usually mona- 

 delphous. Racemes simple or panicled. 



• * • Anthers uniform. Herbs, climbing .by tendrils or twining, sometimes prostrate: 



stameus diadelphous: pod flat,2-valved: racemes axillary (or flowers axillary 

 in Cologania and Rhynchosia). 

 t Leaves abruptly pinnate, terminated by a tendril: seed-stalks broad at the 

 bilum. 

 Vicia. Stamen-tube oblique at the mouth. Style filiform, hairy around and 



below the apex. 

 Lathykus. Stamen-tube nearly truncate. Style dorsally flattened, usually 

 twisted half around, hairy on the inner side, 

 tt Twining or prostrate herbs, with 3-foliolate leaves. 

 \ Flowers not yellow : seeds several. 

 Cologania. Calyx tubular. Style naked. Bracts persistent. 

 Galactia. Calyx 4-cleft. Keel nearly straight. Style naked. Bracts minute 



or caducous. 

 Piiaseolus. Calyx short. Keel strongly incurved and standard reflexed. 

 Style bearded. Bracts minute or caducous. 

 X X Flowers yellow, axillary : seeds 1 or 2. 



Bhi nciiosia. Flowers small. Style naked. Leaves often resinous-dotted. 



Suborder II. CVESALPINEiE. Flowers more or less irregular, perfect. Perigy- 



nous disk lining the base of the short calyx-tube. Petals 5, imbricated, the 



upper one included. Stamens 10 or fewer, distinct. Seeds sometimes 



albuminous. Radicle not inflexed. 



• Leaves bipinnate ; leaflets small: anthers 10, versatile, dehiscing longitudinally: 



calyx slightly imbricate or valvate. 



