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SHAMROCK
Shamrock is the common name for several unrelated herbaceous plants with trifoliate leaves. White clover, Trifolium repens forma minus, family Leguminosae, was the original shamrock of Ireland; T. procumbens is now commonly used. Saint Patrick used the shamrock leaf to symbolize the Trinity, and a trifoliate leaf of this shamrock is worn by the Irish on March 17 to commemorate Saint Patrick's Day. Other species of Trifolium are often referred to as shamrocks, as is the species Oxalis acetosella in the family Oxalidaceae, a favorite and easily cultured plant for a window garden.
