Four-leaf white clover

From Wikipedia: "It is claimed that there are approximately 10,000 three-leaf clovers for every four-leaf clover. However, an actual survey of over 5 million clovers found the real frequency to be closer to 5,000 to 1, double the said probability. Even so, this probability has not deterred collectors who have reached records as high as 170,000 four-leaf clovers in a lifetime. However, the world record for four-leaf clovers in a single day is at least 166, with the record for one hour being 166, set by an American named Katie Borka on June 23, 2018."

iNaturalist's website says: "Introduced in Middlesex County, US, MA: arrived in the region via anthropogenic means"