I was offered some "krolyiang" the other day. The whole bag pictured costs just 500riels or USD0.125 cents. It's a kind of furry berry which is rather tasteless. The fur feels weird on your tongue. It is very small, and has a hard seed. It looks like the wolfberry/枸杞(gou qi) [6] but I'm not sure. I tried to google to find the English name but had no luck.
I did find this interesting site [7] listing tropical fruits by scientific name. Many of the links have photos so I had an interesting browse. Click on Morus Nigra or Black Mulberry - it looks like a stubby caterpillar!
Anyway, the tree must be common enough. There is even a market here in Siem Reap, Psar dum krolyiang, which is named after the fruit tree.
A friend of mine told me "My guess based on the name and her pictures is Dialium cochinchinense, a forest tree. The fruits are edible, the bark can be used to make a brown dye and the wood is good for things pillars and short joists (as in rice mills or carts). Anyone has any other ideas?
Links:
[1] http://expat-advisory.com/articles/77
[2] http://expat-advisory.com/articles/288
[3] http://2.bp.blogspot.com/_GhA3jgBkzBE/SrYZfShEL4I/AAAAAAAABT8/xP6YXO95BHg/s1600-h/kroliang1.jpg
[4] http://1.bp.blogspot.com/_GhA3jgBkzBE/SrYZa5UFv-I/AAAAAAAABTs/vypvgiq8Vw8/s1600-h/krolaing.jpg
[5] http://1.bp.blogspot.com/_GhA3jgBkzBE/SrYZcp7Sr5I/AAAAAAAABT0/LPjzyltKsK4/s1600-h/kroliangseeds.jpg
[6] http://en.wikipedia.org/wiki/Wolfberry
[7] http://www.tradewindsfruit.com/fruitsscientific.htm