I believe this is a Cryptochloa species, but could certainly be wrong. The Olyreae, which are grasses in subfamily bambusoideae are not a group that I have researched a lot or even noticed much in the field. But, when you come across these smaller, pretty species it is hard not to stop and admire them. This particular species was growing on a clay bank with a decent amount of leaf-litter covering it. They seem to prefer the edges of forest where there is more light, but still a lot of protection from the sun. The graceful arching stems would add beautiful shape to the right terrarium.