It would be great to know its id!
May I suggest to put it up in the plant identification forum?
http://garden.org/forums/view/...

@Zomba @bonitin:
Might this be Hippobroma longiflora aka Laurentia longiflora?

Maybe it is somehow related to Hippobroma longiflora..

I agree, @Zomba's photos sure look a lot like Star of Bethlehem (Hippobroma longiflora)

Oxyanthus goetzei and Oxyanthus speciosus subsp. stenocarpus are native to Malawi, but those wavy-edged leaves look a lot like photos online of Oxyanthus pyriformus, which is native to neighboring countries & possibly to Malawi as well?
http://pza.sanbi.org/oxyanthus...

And if it isn't a native Oxyanthus species, it could still be an import, of course.

There aren't as many photos of the Malawian species online, so it's quite possible that either/both may have wavy-edged leaves as well...

It is a very cool plant, whatever it is.

Virginia