22 МЕ. Ө. BENTHAM'S SYNOPSIS OF DALBERGIEX, 
sidered as genera. The two which pass the most into each other 
are the two first, Brachypterum and Euderris, hitherto universally 
regarded as separate genera ; the flowers and inflorescence are the 
same in both, the vexillum has no callosities, the stamens are all 
united (except in one American species, where the tenth stamen 
is often very early isolated), and the pod is winged on'one edge 
only ; the only difference consists in the shape of the pod, narrow, 
pointed, and more Dalbergia-like in most species of Brachypterum, 
broad and rounded at the top in most species of Euderris; but 
D. guianensis, D. javanica, and one or two others are intermediate, 
as it were, between the two. The third section, Dipteroderris, 
has the vexillum and stamens of Euderris, but usually а more pani- 
culate inflorescence, the pod generally thicker and winged along 
both sutures instead of along the upper one only. In one species, 
however, the wing of the carinal or lower suture often disappears, 
varying much on the same specimen. The fourth section, Para- 
derris, has the stamens and pod of Euderris, except that the latter 
is usually thicker and harder, but the vexillum is thickened at the 
base into two small callosities or inflected appendages; the inflo- 
rescence is also peculiar, the fascicles or short side-branches of the 
raceme (or racemiform panicle) are pedunculate, not closely sessile 
as in the other sections. Paraderris includes also the only true 
Derris which has the vexillum silky-hairy, as in so many Loncho- 
carpi and Millettias. Lastly, the fourth section, Aganope, with 
the vexillum and pod of Dipteroderris, has the tenth stamen 
always quite free, with a thyrsoid inflorescence approaching that of 
the paniculate Brachypterums and Dipteroderrises. This sectional 
name is taken from that of Miquel’s proposed genus .4ganope, 
although without the same limits, for Miquel distinguished Derris 
and Aganope by attributing to the former monadelphous stamens 
and a pod usually one-winged only, and to Aganope diadelphous 
stamens and a two-winged pod; but the two latter characters are 
known to go together in one species only, the D. thryrsiflora 
(Aganope floribunda, Miq.) ; D. marginata (Aganope marginata, 
Miq.) has monadelphous stamens with a two-winged pod, and 
D. sinuata diadelphous stamens with a one-winged pod. 
I adopted for the whole genus Loureiro's old name, Derris, 
because I could clearly identify it with his character, but I have 
been unable to take up the names of either of his two species ; for 
the one, D. pinnata, of which he had not seen the fruit, proves to 
be the common Dalbergia tamarindifolia ; the other, D. trifoliata, 
is a trifoliolate variety, or rather specimen, of a species which has 
