Crenate. Dentate with the teeth much rounded.
Crenulate. Finely crenate.
Crested, Cristate. Bearing an elevated appendage resembling a crest.
Crown. An inner appendage to a petal, or to the throat of a corolla.
Cruciate. Cross-shaped.
Crustaceous. Of hard and brittle texture.
Cucullate. Hooded or hood-shaped; cowled.
Culm. The peculiar stem of sedges and grasses.
Cuneate. Wedge-shaped; triangular with the acute angle downward.
Cuspidate. Tipped with a cusp, or sharp and rigid point.