Cotyledon (cotyledo). Seed-leaf, i.e., one of the first leaves of the embryo, which differ from the following.
Crenate (crenatus). With rounded teeth at the margin.
Crustaceous (crustaceus). Crusty, i.e., thin and brittle.
Cyme (cyma). An inflorescence of the centrifugal (cymose) type, especially when loose and equally-branched.
Cymose (cymosus). Consisting of a main axis, which ends in a flower, and several stronger lateral axes.
Cystolith (cystolithus). Cell-stone, i.e., a hard outgrowth of the cell-wall, appearing as a point or short line on the surface of the leaves of certain plants.
Deciduous (deciduus). Falling off after flowering or at the end of the season.
Decumbent (decumbens). Reclining.
Decurrent (decurrens). Prolonged below the insertion.
Dehiscent (dehiscens). Opening spontaneously when ripe to discharge the contents (seeds or pollen).