Shorea sect. Pachycarpae
Content
Description
Small or large stoutly buttressed trees.
Bark surface remaining smooth and hoop-marked longer than in other sections, later becoming +- flaky, sometimes scroll marked.
Leaf with scalariform tertiary nerves;
Stipules, bracts and bracteoles persistent, large.
Notes
Flowers of S. splendida and S. stenoptera are visited by small Hymenoptera as well as thrips (S. Appanah) and are thought to be pollinated by them. The only uniform and constantly distinguishable widespread species is S. meeistopteryx; all others exhibit much geographical variability, with high uniformity within populations nevertheless, and apparent hybridization with one or more species in some part of their range. Embryogenesis appears to be normal, self-incompatibility high (Chan H. T.) and the group appears therefore to be undergoing active speciation.