Tetrapleufa.] xlvii. § mimosejE (olive r). 331 



2. T. andongensis, Welw. mss. Tree of 15-25 ft. or more ; ex- 

 tremities terete, glabrous, the epiderm early splitting longitudinally. 

 Leaves 6-10 in. long-, wholly glabrous ; pinnae in 3 or 4 pairs, occa- 

 sionally alternate ; leaflets about 14-16 to each pinna, usually alter- 

 nate, distinctly petiolulate, elliptical or ovate-elliptical, very obtuse 

 entire or retuse at the apex, venation very obscure, 6-9 lines long-, ^-^ 

 in. broad, petiolule 1 line or less. Flowers not seen. Legume 4-5 in. 

 long*, 1 in. broad, pointed, each valve with a narrow coriaceous longi- 

 tudinal wing about \-\ in. high. 



Lower Guinea. Angola, Pungo Andongo, Dr. Welwitsch I 



3. Besides the above, Dr. Welwitsch collected in Golungo Alto specimens of the fruit 

 of probably a third species of Tetrapleura (T. obtusangula, Welw. mss.) The legume 

 is about 4 in. long, clavate-tetragonous, obtusely apiculate and obtusely rhomboidal in 

 transverse section. It was borne by a tree of 25-30 ft., the leaves of which Dr. Wel- 

 witsch was unable to collect. 



Possibly to the same species may belong fruits in the Kew Museum, collected in 

 South Central Africa by Dr. Kirk. These are nearly 6 in. in length, and less distinctly 

 clavate. Shorter legumes 3^-4 in. long, obtuse and apiculate, curved or straight, inter- 

 mediate in transverse section between the tetragonous fruit of T. obtusangula and the 

 tetrapterous fruit of T. Thonningii, were also collected by the same naturalist on the 

 Rovuma river. 



7. PROSOPIS, Linn. ; Benth. et Hook. f. Gen. PI. i. 591. 



Flowers 5-merous, sessile or subsessile. Calyx 5-toothed or 5-fid. 

 Petals free (or connate below), oval, valvate, at the base very shortly 

 consolidated with the disk and base of the filaments. Stamens 10, free, 

 exserted ; anthers obovate-rotundate, with a sessile incurved or anticous 

 gland between the divergent apices of the cells (in P. oblonga). Ovary 

 subsessile, oblong, multiovulate ; style slender, stigma terminal, minute, 

 concave. Legume in P. oblonga (§ Anonychium) usually straight, sub- 

 terete, with a thick hard pericarp transversely septate between the 

 albuminous seeds ; in P. ? Kirkii (§ Oireinaria) compressed, circinate, 

 with exalbuminous seeds. — Trees, armed or unarmed. Leaves bipin- 

 nate, leaflets firm or subrigid. Stipules or inconspicuous. Flowers 

 small, in dense axillary spikes. 



Most of the species are American. The Tropical African species are peculiar to this 

 Flora. 



Pinnae 2-3-jugate. Legume sub terete straight 1. P. oblonga. 



Pinnae 6-7 -jugate. Legume flat circinate 2. P. Kirkii. 



1. P. oblonga, Benth. in Rook. Journ. Bot. iv. 1842, 348. A hard- 

 wooded tree occasionally attaining 70 ft. ; extremities unarmed, sub- 

 terete, striate or slightly furrowed, puberulous. Leaves bipinnate, 

 5-8 in., rachis terete, puberulous; pinnae 2-3-jugate with a sessile 

 gland between each pair; leaflets usually 5-11-jugate, elliptic-oblong 

 oval or lanceolate, subacute, usually mucronate, thinly or obsoletely 

 puberulous or pubescent, oblique-based, subsessile, f-1 in. long, \-^ in. 

 broad. Flowers white or greenish yellow in solitary axillary shortly 

 pedunculate dense spikes 1J-2J in. long. Calyx minute, 5-fid, with 



