The genus this plant belongs to is somewhat unclear but it has been suggested to be a Drymonia. It has flowered for at least one person, but I can’t for the life of me find the picture. Whatever it is, it seems to be one of those that either does really well and grows vigorously or is very finicky. Once established, it is fast, and can get much larger than pictured here (leaves a few inches long). It climbs up a background in a very shingler type fashion.
[the flower in this picture somewhat deceptively belongs to a Biophytum]
