(9°) 



Leaves with many relatively small leaflets : spikes elon- 

 gated : ovary sessile: pods straight or merely curved, 

 with woody valves. 2. Siderocarpos. 



Pods with membranous or thin-leathery very flat valves. 



Ovary stipitate : calyx very short and different from the 

 corolla in texture. 3. Havardia. 



Ovary sessile: calyx simulating the corolla, but much 

 shorter, and quite similar in texture. 



4. Aebizzia. 

 Valves of the pod separating from the continuous margin. 



5. Lysiloma. 

 Filaments distinct, or the inner ones sometimes slightly united at the 



base. 

 Ovary stipitate : petals distinct or united, commonly only to below 

 the middle : pods flat, dry, the seeds not in two distinct rows. 



6. Acacia. 



Ovary sessile : petals united into a tubular- funnel form shallowy 

 lobed corolla : pods nearly terete or broader than high, pulpy 

 within, the seeds in two separate rows. 7. Vacheleia. 



Stamens as many as the petals or the corolla-lobes or twice as many. 

 Anthers without glandular appendages at the top. 



Valves of the pod not separating from the continuous margin. 

 Shrubs or trees : seeds transverse in the pod. 



S. Leucaena. 

 Herbs : seeds lengthwise or oblique in the pod. 



9. Acuan. 

 Valves of the pod separating from the continuous margin. 



Pods slightly, if at all, flattened, 4-angled or with a broad 



margin, beaked, not jointed. 10. Morongia. 



Pods flat, jointed, not beaked. 11. Mimosa. 



Anthers, at least in the bud, topped by glandular appendages. 

 Herbs : pods flat and thin, twice or thrice longer than broad. 



12. Neptunia. 

 Shrubs or trees : pods relatively thick, many times longer than 

 broad. 

 Pods straight or merely curved, somewhat constricted between 



the seeds, in lax clusters. 13. Prosopis. 



Pods tightly coiled into a spiral, in bunch-like clusters. 



14. Strombocarpa. 



I. PITHECOLOBIUM Mart. Flora, 20 : Part 2, Beibl. 114. 



i837. 



Leaflets leathery : petioles shorter than the petiolules : ovary pubescent. 



1. P. Guadalufcnse. 

 Leaflets membranous : petioles longer than the petiolules : ovary glabrous. 



2. P. Unguis-Cati. 



