The Philippine journal of science. [Vol. 67, no. 1]

67, 3

Foxworthy: Philippine Dipterocarpacese, III

273

ence to the color of the underside of the leaves, the most conspicuous feature when the tree is seen in the field.
A. aurea is usually a tree of ridge forest, at from 100 to 600
m above sea level, and is known only from the part of the
Archipelago having a nonseasonal climate.
The following collections are referred here:
LUZON, Laguna Province, Bur. Sci. 8985, in fruit (this specimen was not sent me), For. Bur. 15353, with fallen fruit and
leaves: Tayabas Province, For. Bur. 25654, in flower, June,
1916; 31435, in fruit, August, 1931; Camarines Province, For.
Bur. 10700, in fruit, June, 1908; 12809, 13358, in fruit, July
1909; 18723, 21128, 21233, 21725, 30480, flower and fruit, July,
1927; 30479, fruit, July 1927. POLILLO, For. Bur. 3218, fruit,
July, 1905; 26253, 31429, in fruit, July, 1931.
3. Genus HOPEA Roxburgh
Receptacle flat or slightly convex, bearing on its margin 5
imbricate calyx lobes. Stamens usually 15, regularly alternating in 3 whorls, the 5 outer and 5 inner standing opposite
each other and alternating with the petals, the 5 of the middle
row episepalous. Anther cells of equal length. Filaments
broadened towards base, connective prolonged into a long awn.
Styles of most species on a large fleshy stylopodium that, like
the ovary, is smooth or only slightly hairy. In a small number of
species there is no distinct stylopodium, and in these cases the
style is usually long-filamentous, often with a circle of hairs
at the base. The two outer lobes of fruiting calyx developed
into long wings. Pericarp thin-walled. Seed-coat very delicate. Hypocotyl long, half as long, often as long as seed, point
of attachment of cotyledons therefore in middle or at base of
seed. Cotyledons thick, fleshy, deeply 2-lobed, mostly unequal,
placentar cotyledon usually surrounded by the other. Cells of
cotyledons usually filled with starch.
Large or medium-sized trees, some species growing gregariously, heartwood yellowish brown. Leaves usually coriaceous
and smooth, stipules usually small and fugaceous. Flowers
sessile or short-stalked, in 1-sided racemes, these joined in
axillary or terminal panicles. In some species calyx and
branches of inflorescence smooth, in others thickly hairy.
Bark thin or rather thick, smooth or longitudinally fissured.
Dark-colored pyramids of bast fibers always distinct in inner
part of bark. There is never any large development of scleren22729 —3