What houseplant is this?

[SuRichardson]

A friend has a houseplant that she does not know the name of. It has purple/brown delicate triangular leaves and at the moment bears pale pink flowers. It enjoys a well lit windowsill but as the light fades the leaves close up. Has anyone any idea what it is called - it is truly beautiful to see

[sense4all]

I have seen a darker leaved version of this.

http://www.thegardenhelper.com/Maranta.htm

[SuRichardson]

Thanks for your reply but it is not that one.The leaves are more triangular - look a bit like butterfly wings

[hammerman]

Look up maranta (as in the link above) calathea, ctenanthe, stromonthe.

Sounds like it goes by the name of prayer plant hence sense4all's answer.

[SuRichardson]

It's actually a member of the oxalis group - it's purple wood sorrel apparently. A weed some would say - but a very attractive one at that.