128 SCHOMBURGK’S GUIANA PLANTS. 
naliter dehiscentibus, connectivo apice glandulifero. Ovarium 
sessile villosum. Stylus filiformis, apice subincrassatus, trun- | 
catus, stigmate terminali. Legumen P. —ÀArbores, foliis — 
bipinnatis multijugis eglandulosis, spicis elongatis crassis — 
paucis ad apices ramorum paniculatis, floribus numerosissimis — 
sessilibus.— P. filamentosa ; staminibus sterilibus corolla mul- 
toties longioribus.— Arbor elatus. Ramuli crassi glabri, 
Folia fere pedalia rigida. | Petiolus primarius crassiusculus 
supra canaliculatus. Pinnz circa 15-juge, petiolis circa 
3-pollicaribus. Foliola 30—50-juga, linearia, falcata, acuta, 
basi valde obliqua, latere inferiore auriculata, 3—4 lin. longa, 
rigida glabra, supra nitida. Racemi 4—6-pollicares fere 
Dimorphandre macrostachye. Flores fere 1i lin. longi, 
crassiusculi, glabri. Stamina fertilia corolla parum longiora, 
sterilia fere pollicaria, filiformia, albida.—This plant chiefly 
differs from Dimorphandra in the valvate æstivation of the 
corolla, which placesit amongst Mimosee. Its fruit, at present 
unknown, may also probably furnish additional distinctive 
characters. The foliage is that of many Mimosee. ae 
I have a second species from Borba, in Brazil, communi- 
cated to me by the Imperial Academy of St Petersburgh: 
The specimens are in flower only, the foliage and inflores- 
cence are precisely the same as in P. filamentosa; but the 
flowers are rather larger and it may be readily distinguished. 
by the following. character :—P, brevifila; staminibus: bast 
breviter monadelphis, sterilibus corolla brevioribus. " 
In the present state of our acquaintance with the extensive. 
tribe of Mimosee, (of which I possess above 700 species, 
probably not half of what already exist in herbaria,) it is 
difficult to divide them into natural subtribes, but they may 
be provisionally arranged in three groups; 1. Desmanthee, 
in which the number of stamens is definite, (usually 10,) and 
either half the stamens in every flower, or all the stamens in 
some flowers are sterile, filiform, or petaloid ; 2. Eumimosee, | 
with definite stamens,. (usually 10), all fertile; 3. Acacieas 
with indefinite (usually very numerous) stamens. Pentaclethra 
from its affinity to Dimorphandra, might be placed at the 
