or Cockle, in botany, a genus of the decandra pentagynia clas. The calyx is monophyllous; the petals are five, and unguled; and the capsule one-valved. There are four species of the agrostemma, viz. the githago, a native of Britain; the cedrofa, a native of Sicily; the coronaria, a native of Italy; and the flos Jovis, a native of Switzerland.