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

67, 3

Foxworthy: Philippine Dipterocarpacee, III

255

Some of the above material had previously been credited by
me to D. Hasseltii and some to other species now reduced to
synonymy.
The species, as at present understood, occurs from Burma
and peninsular Siam, through the Malay Peninsula and Sumatra
to the Philippines.
4. DIPTEROCARPUS SUBALPINUS Foxworthy.
Dipterocarpus subalpinus FOXWORTHY, Leafl. Philip. Bot. 6 (1913)
950; Philip. Journ. Sci. ~ C 13 (1918) 177.
Large tree. Leaves coriaceous, elliptic-oblong, acuminate,
base subcuneate or rounded, glabrous except for scattered stellate hairs along midrib above and along secondary nerves beneath, 4 to 11 cm long, 2.7 to 7 cm broad; secondary nerves
14 to 16 pairs; petiole 15 to 22 mm long. Flowers unknown.
Fruit about 9 to 13 mm in diameter and 9 to 13 mm tall; long
calyx wings 8.5 to 12 cm long and 14 to 22 mm wide; short
wings erect or only slightly recurved, 7 to 8 mm long, 6 to 9
mm wide.
MINDANAO, Agusan Province, Cabadbaran, Mount Urdaneta,
Elmer 13931 (type in the Philippine National Herbarium),
August, 1912.
The collector's field notes state:
Leaves chartaceous, conduplicate on the upper much deeper green and
lucid side, much paler beneath; infrutescence axillary or lateral, few inches
long, the zigzag yellowish green subpendent stalks few-branched; fruits
pendant, the nut portion subglaucous green, their calyx lobes reddish
margined; the 2 ruber to purpureus ears only slightly curved, the exserted
or apical portion of the seed yellowish.
Dipterocarpus subalpinus is found at from sea level up to
an altitude of over 300 m.
Dipterocarpus subalpinus, D. Hasseltii and D. gracilis are
very closely related. D. gracilis and D. subalpinus have the
same kind of fruit; D. Hasseltii and D. subalpinus agree in
having glabrous, or nearly glabrous, buds. The leaves of
D. subalpinus are generally smaller than those of D. gracilis,
and the number of secondary nerves is usually greater than
in D. Hasseltii. The three short wings of the fruit of D. subalpinzs are also shorter than is the case in D. Hasseltii, and are
not expanded or reflexed as is usually the case in that species.
Merrill 9 reduced this form to synonymy with D. Hasseltii, an
arrangement which is not correct, for the reasons given above.

Tom. cit., p. 90.