The part of the flower that covers the bud, usually green, that consists of sepals and forms the outermost whorl of the flower.
the sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing a developing bud; usually green
(botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green
