578 NOTES ON MIMOSEÆ. 
plane nulle.  Foliola omnia opposita, paucijuga, majuscula 
nunc maxima (rarissime infra pollicem longa, interdum ultra- 
pedalia) ex oblongo v. lanceolato ovata. Flores in umbellas, 
capitula v. spicas oblongas v. rarius elongatas dispositi. 
Spice solitarie v. ssepius fasciculatim pedunculate, axillares v. 
ad apices ramulorum foliis abortientibus paniculate. Flores 
sæpissime albi. 
As already stated under Pithecolobium, the absolute cha- 
racter here relied on for distinguishing Jnga is the simply 
pinnate, not bipinnate leaves. The generality of the species 
differ, it is true, essentially from Pithecolobium in the thicker, 
more fleshy, almost indehiscent pod, with a remarkably thick- 
ened or dilated margin, and never spirally twisted, and the 
flowers are usually longer with a hairy corolla, but many 
species have precisely the flower of Pithecolobium, and even 
the differences in the pod run from one genus to the other by 
almost inappreciable gradations, so that unless the positive 
(and in Leguminose important) character derived from the 
foliage be taken into account, we must either reunite all the 
monadelphous Mimoseæ into one genus, or have recourse to 
vague characters, difficult to appreciate, and still more so to 
describe, and after all remain in doubt as to all species where 
the pod is undescribed—that is, more than one third of the 
whole number known. 
The inflorescence and some other characters have appeared 
to me sufficient to establish the five following substantive 
sections : 
I. Leprinea. Racemi umbelleformes, receptaculo sub- 
| globoso, pedicellis elongatis. Flores parvi, glabri v. tenuiter 
| puberuli.—Species 1-14, 
. IL Diapema. Capitula globosa, longe pedunculata. 
Tee parvi, sessiles v. brevissime pedicellati, tenues, glabri 
. vix puberuli.—Species 15-22. 
"HL Burconia. Spice cylindricæ. Flores parvi, nume- - 
rosi, glabri v. vix puberuli. Calyx campanulatus, corolla 
pluries brevior.—Species 23-36. : 
| IV. PsEuDINGA. Spice ovate v. oblonge. Calyx tubu- ug 
losus. Corolla, speciebus paucis (Glabrifloris) exceptis y yk — 
