Cleistogamous. Fertilized in the bud, without the opening of the flower.
Cleft. Cut about to the middle.
Climbing. Ascending by laying hold of surrounding objects for support.
Cluster. Any assemblage of flowers on a plant.
Clustered. Collected in a bunch of any sort.
Coalescence. The union of parts or organs of the same kind.
Coccus (pl. Cocci). One of the parts into which a lobed fruit with 1-seeded cells splits.
Cochleate. Spiral, like a snail-shell.
Cohesion. The union of one organ with another.
Columella. The persistent axis of some capsules, spore-cases, etc.