Dyera spp. of the family Apocynaceae, including at least the following: D. borneensis, D. costulata, D. laxiflora, D. lowii, and D. polyphylla; also frequently spelled jelutung, native to Indonesia.
I'm not familiar with this wood and have no idea what variety one might expect among the various species that are sold under this name. In my experience, it is not readily available in the USA.
web pics:
plank with wet and dry sections
planks
plank specifically listed as D. costulata
plank with a grain pattern that I don't see in any of the other pics --- don't know whether or not that means it isn't really jelutong
carving blocks
turning stock nicely showing the softness of the wood by the way the eng grain is crushed
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