=Parts.=--_Receptacle_, the part upon which the several organs of the
flower are inserted.
_Calyx_, [Illustration] the exterior floral envelope.
_Corolla_, [Illustration] the interior floral envelope. The calyx and
corolla constitute the _protecting organs_, sometimes called _perianth_.
_Stamens_, [Illustration] the fertilizing organs.
_Pistils_, [Illustration] the seed-bearing organs. The stamens and
pistils constitute the _essential organs_.
=Kinds.=--_Symmetrical_, [Illustration] same number in each set of
organs; _unsymmetrical_, different number.
_Complete_, [Illustration] all the sets present; incomplete, some sets
wanting.
_Regular_ [Illustration] sepals and petals uniform; _irregular_,
[Illustration] sepals or petals unlike.
_Perfect_, stamens and pistils both present; _imperfect_, one set
absent.
_Staminate_, with stamens only; _pistillate_, with pistils only;
_neutral_, with neither.
_Monœcious_, staminate and pistillate on same plant; _diœcious_, on
different plants.
_Dichlamydeous_, having calyx and corolla; _monochlamydecous_, having
calyx only; _achlamydecous_, having neither.
_Di_, [Illustration] _trí_, _tetrá_, _pentá-merous_, [Illustration] two,
three, four, or five parts in each set.
_Sessile_, without peduncle; _pedunculate_, [Illustration] with
peduncle.