This is an endemic hoya to the peninsula: Malaysia and Southern Thailand. It is a fairly common species throughout the peninsula in lowland forest. The flowers are borned on a geotropic (pointing downward in direction of gravity) concave umbel. So it is unavoidable that we always get a backlitted bunch of flowers; it is pretty isn't it (above). The leaves are very succulent and thick, with very strong undulating and rough margins... and the marbled or lichen/mold/fungus-like irregular patch of white makes it very attractive. The leaves (below) are around 15 cm long.