calyx--"All of the sepals of a flower, collectively;" written "calix" by Lewis and others of his day.
sepal--"A member of the outermost set of floral leaves, typically green or greenish and more or less leafy in texture."
involucre -- "A set of bracts beneath an inflorescence; more generally, any set of structures which surround the base of another structure."
peduncle--"The stalk of an inflorescence or of a solitary flower."
subtend--"To be directly below or close to."
decline -- "Curved downward."
bract -- "A specialized leaf, from the axil of which a flower or flower stalk arises; more loosely, any more or less reduced or modified leaf associated with a flower or an inflorescence, but not a part of the flower itself."
axil--"The point of an angle formed by the leaf or petiole with [the stem]."