148 NATURAL HISTORY OF PLANTS. 
the New World only—namely, Hematoxylon, Gymnocladus, Cercidium, 
Martia, Apuleia, Palovea, Elisabetha, Heterostemon, Brownea, Eperua, 
Tachigali, Prioria, Zuccagnia, Pterogyne, Dimorphandra, and Schizo- 
lobium and the other eight genera of the series Sclerolobiee. All the 
remaining genera of the suborder, thirty-seven in number, are 
natives of the Old World only. A large number of types are confined 
to very small areas. Thus, Acrocarpus, Wagatea, and Amherstia occupy 
a very limited region of tropical Asia; and Pferogyne, Zuccagnia, 
Phyllocarpus, Dicorynia, Batesia, Apuleia, Palovea, Elizabetha, Eperua, 
Prioria, &c., a relatively small part of tropical America. In Australia 
only are found Labichea, Petalostyles, and Barklya ; while Storckiella 
is altogether Oceanian. Detarium, Didelotia, Cryptosepalum, Baikiea, 
Daniella, Berlinia, Griffonia, Distemonanthus, and Duparquetia are 
confined to tropical Africa; and Baudouinia, Colvillea, Brandzeia to 
Madagascar and the neighbouring islands. The number of species in 
this suborder may be estimated at about eight hundred and fifty, of 
which some five hundred are peculiar to the Old World, and three 
hundred and fifty to the New. 
The subdivisions which it has been found necessary to make in 
this group for convenience of study, are not the most natural imagin- 
able. The limits of the tribes or series are hardly more precise and 
absolute than those of the suborder itself. However, they are of 
real value in practice ; and hence, without blinding ourselves to their 
artificial character, we have fully adopted the subdivisions proposed 
by Brenruam, which are characterized as follows : 
I. Canina. — Flowers regular. Receptacle concave. Perianth 
and androceum perigynous. Corolla contorted or imbricated; vexil- 
lary petal internal, external, or overlapped on one edge and over- 
lapping on the other. Androceum regular diplostemonous. Stamens 
free. Seed exalbuminous; radicle straight. Leaves imparipinnate 
(1 genus). 
II. Evczsarpinies. — Flowers irregular or subregular. Calyx 
dialysepalous. Corolla imbricated, the vexillary petal internal. 
Androceum diplostemonous, rarely isostemonous. Stamens free; 
anthers versatile. Gynzeceum free, inserted in the bottom of the 
receptacle. Leaves bipinnate, rarely pinnate or unifoliolate (14 
genera). 
