- caducous
- caespitose
- callus
- calycle
- calyx
- cambium
- campanulate
- canaliculate
- capitulum
- carcinogenic
- carina
- carpel
- catarrh
- caudate
- cauliflorous
- cauline
- chartaceous
- chiropterophilous
- chlorophyll
- chromosome
- ciliate
- circular
- circumscissile
- clavate
- claviform
- claw
- cleistogamous
- climber
- clone
- clustered
- coarse
- coherent
- coiled
- colic
- colluvium
- column
- compound
- concave
- concolourous
- confluent
- conical
- conjugate
- connate
- connective
- connivent
- conoidal
- contort
- contorted
- convergence
- convergent
- convex
- cordate
- coriaceous
- corolla
- corrugated
- cortex
- cortical
- corymb
- costa
- cotyledon
- crateriform
- crenate
- crenulate
- crescent-shaped
- cross-pollination
- crown
- crustaceous
- crystalline
- cultivar
- cuneate
- cupular
- cupuliform
- cushion-shaped
- cusp
- cuspidate
- cyme
- cymose
- cymule
- cystolith
- cytoplasm