Branches, primary. The leading or main branches thrown out directly from the trunk, giving a general shape to the head.
Branches, secondary. Never directly from the trunk but from other branches.
Buttressed. Supported against strain in any direction by a conspicuous ridge-like enlargement of the trunk vertically to the roots. Several of these buttresses often give a tree a square appearance.
Caducous. Dropping off very early after development.
Calyx. The outer set of the leaves of the flower.
Campanulate. Bell-shaped.
Capitate. Head-shaped or collected in a head.
Capsule. A dry compound fruit.
Carpel. A simple pistil.
Catkin. See ament.