Polycarpon tetraphyllum

About

Polycarpon tetraphyllum, commonly known as four-leaved allseed, is a plant of the family Caryophyllaceae. An annual herb growing to 15 cm in height, it is found on sandy soils, in coastal areas and on wasteland. Native to Europe, it is also naturalised in parts of North America, Australia and elsewhere. It is rare in Britain, except in the Scilly Isles.

Summary from Wikipedia