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(three leaf clover)
The shamrock, a symbol of Ireland and a registered trademark of the Republic of Ireland, is a three-leafed old white clover, sometimes of the variety Trifolium repens (a white clover, known in Irish as seamair bhán) but today usually Trifolium dubium (a lesser clover, Irish: seamair bhuí).
The diminutive version of the Irish word for “clover” (“seamair”) is “seamróg”, which was anglicised as “shamrock”, representing a close approximation of the original Irish pronunciation. However, other three-leafed plants – such as black medic (Medicago lupulina), red clover (Trifolium pratense), and Common wood sorrel (genus Oxalis) – are sometimes designated as shamrocks. The shamrock was traditionally used for its medical properties and was a popular motif in Victorian times. It is also a common way to represent St. Patrick’s Day. Shamrocks are said to bring good luck.