Agrostemma is a genus of annual plants in the family Caryophyllaceae, containing the species known as corncockles. Its best-known member is A. githago, the common corncockle, which is a native of Europe. The species is a weed of cereals and other crops, probably with a centre of origin in the eastern Mediterranean. It occurs as a weed worldwide, but is declining in its native range because of improved seed cleaning. Corncockle is an attractive plant, and its seeds are still commercially available to gardeners.

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