OF THE DIPTEROCARPACEEX. 25 
secondary nerves are also folded in half. The folds between two 
secondary nerves in most species are clearly seen in the mature 
leaf, and in some cases the tertiary nerves show an angle along 
the line of this fold. Flowers large, in few-flowered racemes, 
which are sometimes branched. Receptacle concave, continued 
into a campanulate, tubular, or obconical tube, the segments of 
which are valvate or slightly imbricate in bud, unequal in size, 
two segments being longer. Petals at the base often cohering, 
but not connate. Stamens o, the anthers sometimes twisted. 
Connective prolonged into a long pointed acumen; valves gene- 
rally equal, in some species ( D. Hasseltii, Blume, D. crinitus, Dyer, 
D. insularis, Pierre) unequal. Ovary generally hairy, continued 
into a conical fleshy stylopodium, terminating in a filiform style 
anda minute stigma. Tube of fruiting-calyx not adnate to fruit, 
globose or ovoid, smooth or with five ribs or wings, alternating 
with segments, and formed by the decurrent margins of the 
segments, two of which develop into large membranous or 
coriaceous wings. Pericarp thin at the base, thick and fibrous in 
its upper portion. 
The mature seed often albuminous, and in this case the coty- 
ledons thin, folded, and often lobed. When in the mature seed 
allalbumen has been consumed, the cotyledons are intricately 
folded. Hypocotyl(radicle) generally short. The cotyledons of 
the germinating seed remain enclosed in pericarp and tube of 
fruiting-calyx, being attached to the hypocotyl by petioles which 
sometimes are 5-6 inches long. 
The pith of a leaf-bearing internode, near the circumference, 
has a large number, up to 100, resin-ducts, which sometimes are 
arranged in two concentric circles. There are 3 leaf-traces, 
2 lateral and 1 apical ; the lateral leaf-traces enter the bark at 
varying levels, generally in the upper half of the internode. 
Besides these, a number (7-12) of stipular traces are in the bark 
below the node, and afterwards enter into the amplexicaul stipules 
(Plate I. figs. 11, 12). Burck and Heim state that 5-9 (not 3) 
cortical leaf-traces enter the petiole. The petiole below the in- 
sertion of the blade shows on the underside a semicircle of 5-12 
halfmoon-shaped vascular bundles, either continuous or distinct, 
each with a resin-duct. This semicircle is more or less closed 
on the upperside by a bar of xylem with phloém outside (in 
D. pilosus, Roxb., there is a continuous ring of xylem and phloém 
with 11 resin-ducts). A central body of vascular bundles, varying 
