Oxalis tetraphylla (often traded under its synonym O. deppei) is a bulbous herbaceous perennial plant from Mexico. It is sometimes sold as lucky clover or shamrock (though it is neither a clover nor a shamrock). In the wild or feral state it is often called four-leaved wood-sorrel after its family, Oxalidaceae. Other English common names for this plant include Lucky Clover, Four-Leaf Sorrel, Four-Leaf Pink-Sorrel and others. It is sometimes called "the iron cross plant" or "oxalis iron cross" because the leaves loosely resemble the iron cross symbol, though this name is not a classic folk term and has fallen out of favour due to the bad political connotations associated with this symbol.

It is in the same genus as the common wood-sorrel (Oxalis acetosella) and has three wild variants: var. tetraphylla (autonym) distributed in the states of Veracruz, México, Morelos and Michoacán, var. mexicana native to Hidalgo and Guerrero regions and var. guerreroensis native to Oaxaca, Guerrero, Michoacán and Colima regions.

...