322 XLVII. § MIMOSE.E (OLIVER). 



Flowers in spiciform racemes. Legume indehiscent, valves with 



a longitudinal thick wing or keel 6. Tetrapleura. 



Flowers spicate. Legume subterete, indehiscent, with septa be- 

 tween the seeds 7. Prosopis. 



Flowers spicate, lower neuter, upper perfect. Legume linear, 



compressed, twisted, indehiscent or dehiscing irregularly . . 8. Dichrostachys. 



Flowers capitate, lower neuter, upper perfect. Legume oblong, 



compressed, 2-valved (Aquatic herb) 9. Neptunia. 



Tribe 3. Eumimosese. — Calyx valvate or setaceous and rudimentary. Stamens 5 



or 10 (4—8); anthers eglandular ; pollen granular. 



Flowers capitate. Legume narrow-linear, straight, 2-valved ; 



valves obliquely depressed between the seeds 10. Desmanthus. 



Flowers capitate (in Trop. African sp.). Valves of legume sepa- 

 rating from the persistent narrower sutures 11. Mimosa. 



Flowers capitate. Legume linear, straight, prickly ; narrow 



valves separating from the persistent broader sutures . . .12. Schrankia. 



Flowers capitate. Legume broadly linear, flat, 2-valved ; valves 



continuous '13. Letjoena. 



Tribe 4. Acaciese. — Calyx valvate. Stamens indefinite, free or consolidated at 

 base only with disk ; pollen-grains cohering in masses. 

 Only genus 14. Acacia. 



Tribe 5. Ing-ese. — Calyx valvate. Stamens indefinite ; filaments united more or 



less in a tube ; pollen-grains cohering in masses. 



Flowers capitate. Legume 2-valved, flat, straight ; valves coria- 

 ceous, separating elastically from above 15. Calliandra. 



Flowers capitate (in African sp.). Legume flat, straight, oblong 



or broadly linear, indehiscent, or 2- valved; valves not elastic . 16. Albizzia. 



Flowers capitate (in African sp.). Legume compressed, coria- 

 ceous, circinate, constricted between the seeds 17. Pithecolobium. 



1. PENTACLETHRA, Benth. ; Benth. et Hook. f. 

 Gen. Plant, i. 588. 



Flowers pentamerous, hermaphrodite (or dioecious). Calyx small 

 campanulate, with 5 broadly rotundate imbricate lobes. Petals connate 

 below, elliptical or oblong-, valvate in aestivation. Stamens 5, alternate 

 with the petals, much exserted; anthers with a minute apical gland 

 and broad cellular disk on the connective of the inner face ; staminodia 

 filiform 10 or 15, opposite to the petals, and with the stamens and 

 inner crenate-margined disk adnate to the base of the united petals. 

 Ovary subsessile ; style equalling the ovary • stigma obliquely capitel- 

 late terminal; ovules indefinite, 6-8 or more. Legumes 2-valved, 

 elongate, compressed, narrowed to the base, valves woody, elastically 

 revolute when mature. Seeds compressed, exalbuminous ; testa coria- 

 ceous or crustaceous, shining ; cotyledons flat, fleshy ; radicle sheathed 

 by the base of the cotyledons. — Unarmed trees. Leaves bipinnate ; 

 pinnae subopposite in numerous pairs, leaflets multijugate shining. 

 Stipules small, subulate, deciduous. Flowers numerous spicate ; spikes 

 usually panicled towards the extremities. 



1. P. macrophylla, Benth. in Hook. Jaurn. Bot. 1842, 330. A tree of 

 15-60 ft. or higher; extremities at first rusty -furfuraceous. Leaves 

 ample 1-2 ft. or probably often longer, rachis minutely often sparsely 



