Oxalis tetraphylla aka Iron Cross Oxalis

Oxalis tetraphylla, also known as Iron Cross or lucky clover, is a bulbous herbaceous perennial plant native to Mexico and Brazil. It has four-split leaves and pretty flowers that make it a distinctive summer blossom on the window sill and a popular ornamental plant. Despite its common name, it is not a true clover but a member of the Oxalidaceae family, related to the common wood-sorrel. In the wild or feral state, it is often called four-leaved wood-sorrel. The plant is also edible, with flowers and leaves having a sharp lemon flavor, but caution should be taken as its oxalic acid content can interfere with the absorption of certain nutrients in the body, especially calcium. The Iron Cross cultivar is particularly famous and has loosely resembled the iron cross symbol, but the name has fallen out of favor due to its bad political connotations. Other common names include Four-Leaf Sorrel and Four-Leaf Pink-Sorrel. It is a relatively rare houseplant that needs regular watering and does best in long-lasting, direct light, less than a foot from a window. The plant has three wild variants, var. tetraphylla (autonym), var. mexicana, and var. guerreroensis, distributed in different regions of Mexico.