A Thai Kaempferia

This is another ground hugging ginger from Thailand similar to K.marginata posted previously but with simple 4 petalled white flower. The flower is very similar to K. pulchra except that its pure white instead of pale purple. In addition, the plant has very dark flattened leaves while pulchra has conventional errect leaves. My guess is that its a form of Kaempferia roscoeana .... can anyone advise ?