There are a few forms of B.ningmingensis, and they all look drastically different to my eyes.  The dark form seems to be very hardy and fast growing, and it flowers all the time.  Leaves are a velvety dark green, with newer growth being lighter green.  It is a newer species from China that grows to about 10″. It will often grow very close to the substrate, especially at first, forming a little tented area on the substrate.