120 MR. BENTHAM ON MALVACEJE 
of the petals, but somewhere between the margin and the mid- 
rib *. 
If the supposition, or as some would say conjecture, that the 
andreecium of most Sterculiacex consists of five leaves, each bearing 
1, 2, or more marginal anthers, be admitted, we must, in order to 
account for the internal position of the terminal point and for the 
extrorse direction of the anthers, further suppose that the edges of 
the leaf are slightly revolute in estivation, not involute or inflexed 
as is usually the case with staminal leaves when not valvate or 
open. Similar exceptions to the ordinary sstivation occur, how- 
ever, in other instances. Ordinary extrorse anthers do not indeed 
necessarily involve such an explanation, for petiolar glands may 
occur on the back as well as on the front of the leaf; but in many 
Laurines for instance, where the stamens are in three or four 
series, there is evidently a diversity in their estivation, those of 
the outer series being involute, and the inner ones revolute. 
ABROMA, Jacq. 
The so-called strophiola in this genus is not an expansion of 
the hilum of the seed, nor yet of each separate funiculus, but a 
projection of the general placenta upon which the seeds are sepa- 
rately attached. 
A. nitida, Popp. et Endl., belongs to Herrania, as well as the 
A. Marie, Mart., already referred to that genus. 
GUAZUMA, Plum. 
The genus Diuroglosswm, Turczan., described in the Moscow 
Bulletin, 1852, is nothing but the common Guazuma tomentosa. 
AYENIA, Linn. 
In this genus and in a few species of the closely allied Buett- 
neria, the anthers, solitary between each two sterile stamina or 
teeth of the andrecium, have three parallel cells instead of two. 
This seems to indicate that the anther is compound, and may 
admit of two solutions. Grisebach suggests that the three cells 
may represent the three anthers of Guazuma, which have divari- 
cate but distinct cells, but that here, by their closer combination, 
these divaricate cells have become completely confluent, without 
* Whilst suggesting the above explanation of the abnormal position of the 
stamens in Sterculiacee, I am well aware that the fact of the outer stamens 
being opposite the petals in Geraniacesz and their allies must be accounted for 
on other grounds. 
