| Name | Structure/ Category | Description |
|---|---|---|
| Corm | [Stems] {type} | A short, solid, vertical, usually underground, enlarged stem with leaves that are dry and scale-like or absent. |
| Corolla | The collective term for all of the petals of a flower; the inner perianth whorl. | |
| Corona | an appendage or series of united appendages borne on the inner side of the corolla in certain flowers (as in the daffodil, jonquil, and milkweed) and often resembling an additional whorl of the perianth | |
| Corymb | [Inflorescences] {type} | A racemose inflorescence with the individual flower stalks (pedicels) progressively shorter toward the apex so the flowers are all at about the same level, forming a flat or rounded surface across the top. |
| Cotyledon | the first leaf or one of the first pair or whorl of leaves developed by the embryo in seed plants and in ferns and related plants that functions primarily to make stored food in the endosperm available to the developing young plant but in some cases acts as a storage or photosynthetic organ | |
| Creeping | tending to spread over the ground or other substrate | |
| Crenate | [Leaf margins, Leaflet margins, Petal margins, Phyllary margins, Sepal margins] {form} | With rounded teeth along the margin; scalloped. |
| Crenulate | [Leaf margins, Leaflet margins] {form} | With very small, rounded teeth along the margin; finely crenate or small-scalloped. |
| Crisped | [Leaf margins, Leaflet margins] {form} | Margins divided and twisted in more than one plane, as parsley (Petroselinum crispum) leaves; curled. |
| Cross-shaped | two intersecting lines or bars usu. of equal or approximately equal length and crossing at or about their midpoints |
