250 
FOXWORTHY. 
Marinduque, For. Bur. 12160 RosenUuth. Mindoro, For. Bur. 8836, 12034 
Merritt. Leyte, For. Bur. 12139 Rosenblutli. Mindanao, Province of Surigao, 
For. Bur. 1565 Hutchinson: District of Davao, For. Bur. 11569 Whitford: Dis- 
trict of Zamboanga, For. Bur. 9041 Whitford & Hutchinson. Palawan, For. 
Bur. s. n. Curran. 
Native names, panao, apitong (Tag.), lcamuyao (Cag.), malapaho (Polillo), 
pagsahin gin ( Tag. ) . 
8. Dipterocarpus sp. 
A form with long-caudate-acuminate leaves, 10 to .13 cm long, 2-3.5 
cm broad, glabrous. Stipules linear, ferruginous-pilose. Old and frag- 
mentary fruit picked up under the tree shows the plant to belong to this 
section of the genus. 
Luzon, Province of Albay, For. Bur. 10601, 10610, Curran, June 1908. 
Common name : apitong ( Tag. ) . 
Section II. Alati. Tube of fruiting calyx with angles more or less 
produced into wings. 
9. Dipterocarpus speciosus Brandis in Journ. Linn. Soc. Bot. 31 (1895) 38; 
Perkins in Fragm. FI. Philip. (1904) 22; Whitford in Philip. Bur. For. Bull. 
10 2 (1911) 70. Plate XXXVII. 
Young branchlets covered with long, fasciculate, fuscous, stellate 
hairs. Leaves chartaceous, short-petiolate, oblong-elliptic, with scattered, 
very short, stellate hairs on the midrib beneath. Petiole with long, 
clustered, fuscous, stellate hairs. Leaves 15 to 27.5 cm long; petiole 
18 mm long; secondary nerves 18 pairs; tertiary nerves parallel and 
reticulate. 
Our material has petioles longer than are described for the species, 
but the petioles of D. grandiflorus and related forms seem to show con- 
siderable variation in length. The hairiness of young shoots and petioles 
is probably also a variable character. The thick edge of the fruit wings 
is the most striking feature. There is a considerable range of variation 
from an exceedingly heavy and woody fruit where the wings are reduced 
to ridges, to a condition where the wings are almost as membranaceous 
as in D. grandiflorus. Where these two species occur side by side in 
Negros, there seem to be numerous intergrades. I believe that natural 
hybridization has taken place. 
Luzon, Province of Tayabas, Merrill 1149 Garcia: Province of Camarines, 
For. Bur. 10141, 10165 Curran: Province of Albay, For. Bur. 10616 Curran. 
Negros, Gimagaan River, For. Bur. 1406 Danao, For. Bur. 11351, 11366 Curran. 
Basilan, Vidal 2160. In addition to the above, there is For. Bur. 10111 Curran, 
from the Province of Camarines, Luzon. The leaves of this specimen are very 
large, almost round, very hairy, with crenate margins. The fruit seems to belong 
to D. speciosus, but it was picked up from the ground and may have come from 
another tree. 
Mr. Curran tells me that in Negros, where he has studied this species in the 
field, the petioles are regularly shorter than those of D. grandiflorus, the veins 
