PHILIPPINE DIPTEROCARPACEAE. 
263 
12028 Merritt. Mindanao, District of Zamboanga, For. Bur. 6565, 9496 Hutchin- 
son, For. Bur. 9040, 9289 Whitford & Hutchinson. Basilan, For. Bur. 12369 
Hutchinson. 
Many of our specimens are fragmentary and it is quite possible that there 
may be more than one species in the material cited above. 
The following numbers seem to belong to what Whitford 12 calls black yacal. 
The chief apparent difference in herbarium material seems to he that the leaves 
are a little broader and, perhaps, more inclined to be coriaceous. In drying, .the 
leaves turn very dark and are more or less covered above with a glaucescence. 
Luzon, Province of Pangasinan, For. Bur. 191/45 Agama: Province of Zam- 
bales, For. Bur. 13201, 13202 Cortes. Mindanao, District of Zamboanga, For. 
Bur. 9001/ Whitford & Hutchinson. 
This species produces a resin or gum dammar, which is sometimes collected 
by the natives and used for torches. 
The flowering time of this species is not understood. Blanco, 1. c., says that 
it flowers only in the month of March. In some sections, the people claim that 
it flowers only once in five or seven years. 
Native names: yacal (Tag.), saplongan (Tag.), siggay (Cag.), belie (II.), 
guisoc (B., V., Moro), taggai (II.). 
5. Hopea sp. “Naric.” 
Leaves narrowly oblong, 5 to 10 cm long, 16 to 26 mm wide, apex 
long-candate-acnminate, base rounded, secondary nerves 10 to 12 pairs, 
with domatia in their axils. Petiole 3 to 5 mm long. Stipules early 
deciduous. 
Luzon, Province of Cagayan, For. Bur. 6497, 13414 Klemme. The following 
two numbers probably do not belong here; but, I do not know where else to place 
them.. Luzon, Province of Bataan, For. Bur. 589 Barnes, Mar. 1904. Mindanao, 
District of Zamboanga, For. Bur. 9404 Whitford & Hutchinson, Feb. 1908. 
6. Hopea sp. “Gyam.” 
This large tree seems to be the same as that which occurs under the 
same name in the eastern part of British North Borneo. The bark is 
thin and brownish. The wood is a very heavy and very hard yacal. 
A tree of rather gregarious habit, growing on low flat lands near the 
coast. The leaves are elliptic or elliptic-lanceolate or narrowly oblong, 
3 to 6 cm long and 1.5 to 2 cm wide, apex bluntly caudate-acuminate, 
base cuneate ; secondary nerves 5 to 7 pairs, with very large domatia in 
their axils on the under side. Perhaps the most distinct species which 
we have in the genus. 
A single sterile specimen from Tawi Tawi, For. Bur. 13380, collected by W. 
Schiick, June, 1910. 
7. Hopea ovalifolia Boerl. in Cat. Hort. Bot. Bog. 1 (1899) 102. 
The description of this species is very meager and is from sterile 
material ; but we have a sheet from the garden at Buitenzorg, determined 
by Dr. Boerlage as this species and it seems to correspond quite closely to 
a collection of ours, also sterile. 
Philip. Bur. For. Bull. 1 0 2 (1911) 73. 
