Calyx and Pappus

Calyx noun - (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.

Pappus and calyx are semantically related. In some cases you can replace term "Pappus" with "Calyx", this nouns are similar.

Pappus noun - Calyx composed of scales or bristles or featherlike hairs in plants of the Compositae such as thistles and dandelions.

Calyx and pappus are semantically related. Sometimes you can use "Calyx" instead a noun "Pappus".