Oxalis triangularis (Love plant)

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Oxalis triangularis A. St.-Hil.

Love plant, purple shamrock, false shamrock

Kingdom	Plantae	Plants, but not fungi, lichens, or algae
Subkingdom	Tracheobionta	Vascular plants—plants with a “circulatory system” for delivering water and nutrients
Division	Magnoliophyta	Flowering plants, also known as angiosperms
Class	Magnoliopsida	Dicotyledons—plants with two initial seed leaves
Subclass	Rosidae	Roses, legumes, proteas, dogwoods, hydrangeas, mistletoes, euphorbias, grapes, many more
Order	Geraniales	Balsams, mustards, geraniums, wood sorrels, nasturtiums, others
Family	Oxalidaceae	Wood sorrels
Genus	Oxalis	Wood sorrels (Oxalis means “sour”)
Species	triangularis

About plant names...

False shamrock is a Brazilian native, not found in the wild in North America. (It is possible that this plant [Oxalis triangularis] and Oxalis regnellii are the same plant.)

Identification: This member of the woodsorrel family is a popular house plant in North America, though it can also be grown outside in the zones shown in the range map. Plants reach 8" (20 cm) in height, sporting deep purple, triangular leaves in groups of three, draped from tips of delicate stems like purple parasols. (Some varieties have bluer leaves, or leaves composed of purple and black.) Flowers are white to pink, with five petals, about ¾" (1.9 cm) in diameter.