Arthrostemma parvifolium

Arthrostemma parvifolium is a a Melastome that occurs from Mexico to El Salvador, and is wonderfully suited to terrarium culture.  It often stays under 12″ but can get at least 18″ in some growing conditions.  It forms a small bush and beautiful pink magenta flowers that are easy to pollinate and produce a lot of seed.

The seed pod and seed.  Compared to the seeds of Begonias, these are rather large.  About the size of a very thick grit of sand.  Seed germinate after about two weeks.