黑泡秋海棠/黑峰秋海棠 Begonia melanobullata（Vietnam ferox）

Begonia ferox is a rather new-to-the-scene, awe-inspiring species hailing from limestone areas in southwest China.

The foliage of b. ferox is a jaw-dropping mix of raised black (melano) cones (bullae) that rather resemble teeth, though not sharp to the touch.  The tip of each initially sports a single erect hair-bristle.

Each bulla has a white hair coming out of the tip, which eventually falls off.  so far it has been easy to grow and propagate species, and the leaves seem very sturdy.