What do you get if you cross poison ivy with a four-leaf clover ... or original shamrock. The black medic and yellow wood sorrel are sometimes confused with white clover, especially when the ...

How Rare Is a Four-Leaf Clover? Four-leaf clovers are a variation on the common three-leaf white clover (Trifolium repens). Researchers from the University of Georgia believe a combination of ...

In honor of St. Patrick's Day, many people are likely to wear clothing with shamrocks on them, which are three-leaf clovers with cultural and historical significance to Ireland. But others might ...

The shamrock, not the four-leaf clover, is Saint Patrick's symbol of choice. A three leaf clover is pictured against black in this undated stock photo. Alamy — -- It’s officially March 17 ...