82 
CONTRIBUTIONS TO BOTANY. 
thick as in that genus ; its internal space is rendered 2-celled 
by a very narrow septum, which extends from the hilum to the 
opposite emarginature of the disk ; this septum is fenestrated in 
the middle (or, rather, interrupted) by a linear aperture for the 
reception of the radicle; the two cotyledons are compressed, 
each being divided by deep emarginatures at the apex and base 
extending to the radicle, which thus occupies a central position, 
united to the four cotyledonary lobes, the former filling the 
fenestrated space, the latter occupying the two cells of the disk 
formed by the narrow septum, as in Adenocalymna. The em- 
bryo is enveloped by a delicate inner integument, similar to it 
in form. 
In one of my excursions near Tejuco, in a deep forest, I found 
the ground strewed with seeds of a similar shape and structure, 
which I still preserve : the plant from which they fell was at too 
great an elevation to be reached, and I could not find any re- 
mains of the capsules. These seeds evidently belong to a different 
species of the same genus, and are much larger, though resem- 
bling the former in every other respect, the discoid portion being 
7 or 8 lines in diameter, the wing 5 lines broad, the total extent 
(including the wings) measuring 2 inches. 
The plant in question hardly appears to be a true Adeno- 
calymna, and I place it there with some hesitation. Pachyptera, 
in the absence of all knowledge of its floral structure, is still a 
doubtful genus ; but its seminal characters seem to agree with 
this species. Will Pachyptera prove to be a subgenus or section 
of Adenocalymna ? This appears probable, because the two spe- 
cies, /ofeo/fl/a and umbelliformis, which are associated with the 
type, puberula, have the many-foveolated punctures about the 
axils of the branches, which are almost peculiar to Adenocalymna 
and Haplolophium. The P. dasyantha, DC., which I have seen, 
belongs to the latter genus; while the two remaining species, 
striata and Perrottetii, appear foreign to the group. 
Adenocalymna ? caesium, n. sp. ; — ramulis teretibus, striatis, 
pallide glaucis, pilis articulatis dense velutinis, demum sub- 
glabris, ad nodos dilatatis; foliis 3-foliolatis aut conjugatis et 
ecirrhosis, foliolis ellipticis, imo obtusiusculis, aut subacutis, 
3-nerviis, apice brevissime attenuatis, obtusis et emarginatis, 
coriaceis, supra pallide viridibus, opacis, costa mediana ner- 
visque subimmersis cano-puberulis, subtus pallide glaucis, 
glaberrimis, nervis venisque valde reticulatis, prominen- 
tibus, nervo marginali cartilagineo, reflexo, dense poroso- 
punctulatis, glandulisque paucis immersis signatis; petiolo 
petiolulis paulo longiore cunctis apice tumidulis, teretibus, 
dense et sordide cano-tomentellis ; racemis axillaribus fructi- 
