14 MR. G. BENTHAM’S SYNOPSIS ОЕ DALBERGIEJE, 
CYCLOLOBIUM. 
A genus of four closely allied South American species, whose 
immediate affinities I cannot satisfactorily trace. The inflores- 
сепсе is nearly that of the subracemose Dalhergieas, the fruit 
orbicular as in Ecastaphyllum and Pterocarpus, thin, with a mar- 
ginal wing as in some Derrises, but it has neither the anthers of 
the two former, nor the habit or flowers of the two latter genera. 
In all the species the leaflets are solitary and terminal, so that their 
relative arrangement is no guide; but I have placed it amongst the 
genera with alternate leaflets, because the inflorescence and flowers 
indicate no affinity with Lonchocarpus and its allies. 
MACHJERIUM and DREPANOCARPUS. 
These two genera, so closely connected with each other as not 
to be distinguishable without the fruit, were widely separated by 
the older authors. Even De Candolle, leaving Drepanocarpus next 
to Pterocarpus among Dalbergice, united Macherium with Nissolia 
among Galegee, characterizing it by the papilionaceous corolla, 
united stamens and samaroid fruit. The true Missolia has, how- 
ever, since been shown to be Hedysareous, and Macheriwm to 
have all the characters of Dalbergiee. In this tribe the latter 
genus is readily known by its constantly monospermous pod ex- 
tended into a wing proceeding from the apex, not from the base 
as in Platypodium, the remains of the style being at the summit of 
the wing, not forming a spur at its base, as in Centrolobium, and the 
venation of the wing showing that it is an attenuation of the end 
of the pod, not a lateral appendage to the style, as in Tipuana. In 
flower, Macherium is always distinguished from Dalbergia and 
Ecastaphyllum by the versatile anthers, and generally from Ptero- 
carpus and its allies by the shape of the calyx, the downy vexillum 
or other characters not quite universal, and from Lonchocarpus 
and its allies by the leaflets mostly alternate, by the wings free 
from the keel, by the staminal tube never forming a complete 
sheath, &c. Some species may, however, without the fruit, be 
confounded at first sight with Andira, but the keel-petals united 
near the apex, the single (very rarely 2) ovules, the smaller flowers, 
and general habit, will, in most cases, separate the Macheriwms 
even before the ovary is at all enlarged. 
I have enumerated fifty-six species of Macherium, all American, 
and affording still less than Dalbergia any characters in flower or 
fruit by which they can be divided into sections. All that I have 
