This plant is called syngonaNthus mikado. Well, you can find both of the names...
I can't find all the pages you cited, but you can visit the following page for some pictures:

http://ens.ch/ens/herbarium/

This page is german, too. But there is no new information; it's just the IKEA label.

Obviously, it feels quite fine in the bathroom, where it is humidous and not too dark.

Regards - Arthur Dent