Photo and text by Bob Stewart
This plant is notorious for never producing seed, just "propagules". The propagules are produced on what should be flower stalks, as "fuzz" along the stalk. Scrape this stuff off, throw it on the ground, and it will grow. I don't know what this structure develops from, maybe it is much reduced leaves?
I have heard that this plant is also the only rhizomatous gesneriad in the Old World.
It grows readily, treat it like any other rhizomatous gesneriad. You may get flowers by good luck, or you may have to keep pinching off stalks full of propagules until the plant is convinced to produce flowers.
Photos of a different clone of this species can be seen here and here.