LEGUMINOS4-MIMOSEZ. 45 
ventral suture by curved clefts prolonged between the seeds so as 
to form as many distinct cells united by the persisting dorsal suture ; 
this is bent or twisted on itself, so that the one-seeded divisions of 
Acacia (Zygia) Sassa. 
Fra. 35. 
Flower (4). 
the same pod have all different inclinations to the horizontal. 
Fia. 34. 
Longitudinal section of flower. 
But 
the pod never opens elastically as in Calliandra, and this is the 
character, artificial indeed though it be, which suffices in practice to 
distinguish the genus Pithecolobium. The species, about one hundred 
in number,’ are trees and shrubs from all warm regions, especially 
tropical Asia and America. 
variable.’ 
Their habit and inflorescence are very 
1 Waxp., Rep. v. 609; Anm,, i. 2673 ii. 458 ; 
iv. 636. 
2 These characters have been chiefly used to 
subdivide this large genus into sections. The 
fruit varies greatly in form, but with innu- 
merable transitions between its variations. 
Bentuam admits the seven following sections :— 
I. Samanea.—This section whose type is, as 
indicated by its name, P. Saman Bentu. (Inga 
Saman W., Spec, iv. 1026;—I. salutaris 
H. B. K., Nov. Gen. et Spec., vi. 304 ;—Mimosa 
Saman Jacq, Fragm., +. 9 ;—Calliandra 
tubulosa Benvx.), contains twenty-five species 
of unarmed trees with stipules iil developed or 
absent. The pinnules are indefinite in number’ 
The inflorescences are axillary, fascicled or col- 
lected into terminal panicles, The pod is straight, 
bowed, circinate or cochlear, coriaceous thick and 
indehiscent, or dehiscent without subsequent 
distortion of the valves. The seeds are arillate. 
(Vettoz., Fl. Flum., xi. t. 24, 30 (P).—Jacg., 
Fragm., t. 9.—K., Mimos., t. 21.—Griszs., 
Fl. Brit. W. Ind., 225). This last author 
makes the species of the section belong to 
Calliandra, though the pods do not present the 
dehiscence peculiar to that genus. 
II. Chloroleucon.—Trees unarmed or occa- 
sionally possessing axillary spines, stipules 
