274 | NOTES ON DIPTEROCARPS. 
them; and his opinion always deserves consideration: but beyond 
that he went wrong in not seeing that the peninsular matérial was 
different from the really unlike Vatica Wallichii. 
In considering whether King was right to keep apart that 
Malayan material from the Bornean type, and right also to dis- 
tinguish specifically P. Stapfianus, we have met with much diffi- 
culty. We have ended in keeping the peninsular and the Bornean 
material apart, more from caution than from conviction, and find 
the Pachynocarpus-portion of King’s P. Wallichw not separable 
specifically from his P. Stapfianus. If however, there is a con- 
fusion in Motley’s specimens, and it can be of. a Vatica in flower 
mixed with a Pachynocarpus in fruit (flowers and fruit were pro- 
bably gathered months apart), then the flowering specimen is likely 
to be a flowering Vatica and perhaps V. Wallichu, while the fruit- 
Ing specimen (which is P. umbonatus) may not differ from P. 
Stapfianus. More study in Borneo is needed to decide this both 
near Labuan, and because Motley’s last years were at Banjermassin 
in the south east. 
At flowering time there is no sure mark ina herbarium speci- 
men by which Pachynocarpus can be distinguished from Vatica 
Wallichu. That led to King’s mistake of identifying the two; 
and a fair measure of variability in the calyx caused him to think 
that the adhesion which is not visible in the flower, came quite late 
in fruit-development, whereas it commences from the fall of the 
petals. The diagrams printed above indicate some of the varia- 
tion in the calyx. We have had good opportunities of studying 
Vatica Wallichu alive, because it is a tree cultivated in the Econo- 
mic Garden, Singapore, and because also it is by no means un- 
common round the coasts of the Malay Peninsula. It has been 
planted on dry ground in the Economic Garden and has grown 
well; but its natural habitat is upon ground Hable to flooding. 
Herbarium specimens prove its occurrence down the west coast of 
the Peninsula, certainly from Province Wellesley, and possibly 
from Trang in Lower Siam, to Singapore; and down the east coast 
from Kuantan to Singapore. It, by being identified with Burck’s 
Vatica ruminata, is known also from Bangka. It is possible that 
Dr. Haviland’s flowering specimens, Nos. 1907 and 1908, from 
near Kuching, Sarawak, may be it; but fruits are necessary for 
makine this sure. 
To Malays it is one of the several trees called Resak. Resak 
paya (swamp resak) is a name for it in Pahang and so are Resak 
pasir (pasir may mean sand, sea beach, or a certain quality in a 
wood which causes it to take the edge off cutting tools) and 
Resak laru,* which last belongs also to “Pachynocarpus Stapfianus. 
Goodenough, Ridley’s collector, called it Damar Mata Kuching on 
specimens collected in Singapore island and in Malacca. Derry in 
Malacca called it Kayu Merbatu Pasir, 
* Laru is a substance used in making sugar. In this particular case, 
it is said that punctures or cuts are made in the bark; the resin which 
exudes is collected and placed into syrup which is being boiled, causing 
it to harden into sugar with a yellow colour. 
Jour. Straits Branch 
