What plant is this?

[Psypomp]

Hello fellow growers! There is a plant in my school's library that is beautiful, but unfortunately I don't know what it is! Can anyone help me out?

In case it isn't clear from the photo, the foliage is a set of 3 triangular purple/magenta bracts (leaves that act like petals) on each stem.

[Riz]

hi ^

I believe it is a purple oxalis they have a wild native cousin called wood sorrel, aka 'sourleaf'

http://images.google.co.uk/images?q=purple+oxalis&oe=utf-8&rls=org.mozilla:en-GB:official&client=firefox-a&um=1&ie=UTF-8&ei=sH73Sov_B8TOjAfM3sXUCQ&sa=X&oi=image_result_group&ct=title&resnum=1&ved=0CBYQsAQwAA

[Kirsten]

Sorry I can't help you on the name, but that is a beautiful plant, especially in the sunlight! Wow!

[Riz]

do the leaves curl up during the night !?

or it could be commonly know as false shamrock, (Oxalis regnellii
). its in the legume family of plants http://home.howstuffworks.com/false-shamrock.htm