DIPTEROCARPACE A. 213 
one or two seeds with an embryo having lobed corrugate or contortu- 
plicate cotyledons. In this genus the leaves are accompanied by 
large stipules enveloping the buds, and are afterwards detached 
at their base leaving upon the branches a large circular cicatrice. 
Beside the Dipterocarpee is placed Anisoptera, having also a 
fruit accompanied by two large wings, but which is distinguished 
from them inasmuch as its ovary and fruit are partly at least inferior in 
reference to the insertion of the calyx, but adnate to a concave recep- 
tacle, the edges of which bear the perigynous perianth and andro- 
ceum. Their ovary is surmounted by a full conical projection, 
which in itself would seem to resemble a superior ovary. It is 
almost impossible at the adult age, and from dry specimens, to 
determine the mode of arrangement of the stamens in the preceding 
genera; but when the number becomes defined, or nearly so, it can 
be seen that they are arranged in verticils. It is so in certain 
Vaticas, with 10 or 15-androus flowers. They have five oppositi- 
petalous stamens, five others alternipetalous, then, outside each of 
these latter, a very small stamen, situated in the same vertical plane. 
The stamens may also be more numerous in this genus; but it is 
always distinguished from the preceding by its calyx, which is sub- 
valvate, or with the pieces not touching each other in the bud, and 
forming round the fruit five large free wings, unequal or nearly equal, 
not adhering to the pericarp, and not forming round it by their 
bases a sac enveloping it closely. 
Beside Vatica are ranged Pachynocarpus, having the same 
flowers, but with a concave receptacle, in which the fruit is encased, 
as in Anisoptera, and a calyx which disappears round the fruit; and 
Vateria, having the free ovary of Vatica, but a small calyx, not 
accrescent, and reflexed under the pericarp ; d/onoporandra, which, 
with the fruit of Vaferia, has only five stamens to the androceum ; 
Hopea, having the flower of Vateria, and two only .of the five 
non-adherent sepals dilated in wings round the fruit; Shorea, very 
analogous to Hopea, has three sepals accrescent in large wings, and 
two others much less developed ; lastly, Doona, the fruit of which, 
also accompanied by three large wings, encloses an embryo with 
cotyledons much contortuplicate, instead of being thick and fleshy, 
plano-convex, as in the preceding genera, the flowers being otherwise 
sensibly the same. 
