Oxalis Triangularis (Purple Shamrock)

Oxalis triangular, commonly called the false shamrock is a perennial plant in the family Oxalidaceae. This woodsorrel is normally grown as an indoor plant but can be grown outside, preferably in light shade. Actually, its leafage is a very deep purple color. The leaves are triangular and normally grow in clusters of three. At night (or on cloudy days) they wrinkle up almost like an umbrella, but they open up again with the morning light.