#sepal  one of the green parts that form the calyx of a flower
  supertype:  floral_leaf  a modified leaf that is part of a flower
  part of:  calyx
  subtype:  calyx  the sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing a developing bud; usually green
     subtype:  hull.calyx  persistent enlarged calyx at base of e.g. a strawberry or raspberry
     subtype:  pappus  calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions
        subtype:  thistledown  pappus of a thistle consisting of silky featherlike hairs attached to the seedlike fruit of a thistle

No statement uses or specializes sepal; click here to add one.