250 FOXWORTHY. 
MAKi.MJLCiUE, For. liur. 12160 Uoscnblulh. Mi^DOiiO, For. Bur. 88,%\ mS'f 
Merritt. Ij-'-ytk, For. Bur. IZISO Jiosenhhilh. Mindanao, Province of 6uri<,^ao, 
For. Hur. 7.>6*.> Ihtfrhimon: District of Davao, For. Bur. lloGi) Whitford: Dis- 
trict of Zamboan^M, For. Bur. fX).'/! Whitford d- Hutchinfto)!. Pat.awan, For. 
Bur. s. ti. Curran. 
Native names, panao, apitong (Ta«r.), kamutjao (Cag.)* malapaho (Polillo), 
patjh'ith'ntgin (Tag.) . 
8. Dipterocarpus sp. 
A fomi with long-caiidate-acimiinate leaves, 10 to 13 an long, '^-3.5 
cm broad, glabrous. Stipules linear, ferruginous-pilose. Old and frag- 
mentary fruit picked up under tlie tree shows the plant to belong to this 
section of the genus. 
Llzox, Province of Albay, For. Bur. 10607, WOIO, Ourrau, June 1908. 
Common name: apitong (Tag.). 
1 
Section II. Al.a.ti. Tube of fruiting calyx with angles more or less 
produced into wings. 
9. Dipterocarpus speciosus lirandis iiv Jouru. Linn. Soc, Bot. 31 (1895) 38j 
Perkins in Fragm. Fl. Philip. (1904) 22; Whitford in Philip. Hnr. For. lUill. 
10^ (1011) 70. Plate XXXVII. 
Young branchlets covered with long, fasciculate, fuscous, stellate 
hairs. Leaves chartaeeous, short-petiolate, oblong-elliptic, with »scatteved, 
very short, stellate hairs on the midrib beneath. Petiole with long, 
clustered, fuscous, stellate hairs. Leaves 15 to 27.5 cm long; petiole 
18 nun 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. (jnuiilrflonis and related forms seem to show con- 
sifleral)le variation in length. The hairiness of young shoots and petioles 
is probably also a variable charactei'. The tliiek edge of the fruit wing^ 
is the most striking feature. There is a considerable range of varuuion 
from an exceedingly hea\y 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 m 
Negros, there seem to be numerous intergrades. I believe that natural 
hybridip^ation has taken place. 
Luzon, Province of Tayabas, Menill J1J,0 Garcia: Province of Canuirines, 
For. Bur. lOl^l, 10765 Curran: Province of Albay, For. Bur, 1061(i Curran. 
Xegros, Gimagaan River, For. Bur. 7/iOG Dauao, For. Bur. 17351, 173(Hi Curnui. 
Basilan, Tidal 2160. In addition to the above, there is For. Bur. 10711 Curran, 
from the Province of Camarines, Luzon. The leaves of this specimen are very 
large, almost round, very haiiy, with crenate margiuis. The fruit seems to belong 
to D. speciosus, but it was picked up from tlie ground and may have come from 
another tree. 
Mr. Curran tells me that in N^os, where he has studied this apecies in the 
field, the petioles are regularly shorter than those of I), grandi/loru.% the vein« 
'* 
