Verified answer

shamrock=three leaves (remember by the story of when St. Patrick used the shamrock to describe the Holy Trinity to the pagans)

clover=four leaves

Shamrock Vs Clover

Not all clovers, in fact not very many at all, have 4 leaves. You can search all day through the clover patch in my yard and not find one with more than 3 leaves!

they are the same thing. the def of a shamrock is that it is a clover.

shamrock, a plant with leaves composed of three leaflets. According to legend it was used by St. Patrick in explaining the doctrine of the Trinity; it is now used as the emblem of Ireland. An artificial or real shamrock leaf is customarily worn on St. Patrick's Day. The actual species of the true shamrock has long been debated, but the plants most often favored and used are the white clover (Trifolium repens), the black medic (Medicago lupulina), the wood sorrel (Oxalis acetosella), and a hop clover (Trifolium minus). All are classified in the division Magnoliophyta, class Magnoliopsida. Trifolium and Medicago are in the order Rosales, family Leguminosae; Oxalis is in the order Geraniales, family Oxalidaceae.

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RE:

What is the difference between a Clover and Shamrock?

The shamrock, an unofficial symbol of Ireland and Boston, Massachusetts, is a three-leafed young white clover, sometimes (rarely nowadays) Trifolium repens (white clover, known in Irish as seamair bhán) but more usually today Trifolium dubium (lesser clover, Irish: seamair bhuí). 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 Saint Patricks day, a holiday celebrated on March, 17.

The four-leaf clover is often confused with the shamrock. While the four-leaf clover is a symbol of good luck, the three- leafed shamrock is mainly as Irish christian symbol of the Holy Trinity and has a different significance.

Shamrocks have leaves that are more triangle shape and clover leaves are more rounded. Shamrocks are also larger than clover.

Edit:They both have three leaves it is very seldom you find a 4 leaf clover and never a 4 leaf shamrock

a shamrock has 3 leaves and a clover has 4!

Jackie explained it perfectly. However, in answer to your additional details, it's the four leafed clover that brings you good luck. Shamrocks traditionally have three leaves. It's what St. Patrick used to teach the "Pagans" about the Holy Trinity of the Catholic Church. I hope this helps you.

What Is A Shamrock