Alan Gould wrote:
In article , Tamson
Tamson.1pm9k3@gar denbanter.co.uk writes

'Betulia'

Can anyone give me any information about this plant ?

You may perhaps mean Betula, which is a Birch Tree.

My books are still boxed, but there's a dirty great begonia called
something like that. If that's what our subject-line friend means,
I'd treat them just like other begonias: moist atmosphere from a
gravel dish or outer pot packed with peaty stuff, no direct sun, weak
liquid feed when flowering.

--
Mike.