blade. The expanded part of a leaf.
bract. A small or much-reduced leaf, often a mere scale.
calyx. The outer row or series in the floral envelope. The outer “leaves” of the flower, usually green.
cambium. Growth tissue, lying between the bark-part and wood-part of the fibro-vascular bundle and giving rise to the cells of both.
capsule. A pod consisting of two or more carpels or parts, usually opening naturally.
carbohydrate. The compounds of the starch and sugar class.
carpel. One part or member of a compound pistil, or a simple pistil itself.
catkin or ament. A raceme-like or spike-like flower-cluster that falls away after flowering or fruiting, as of willows and staminate flower-clusters of walnuts and birches.
centrifugal. From the inside out; as a flower-cluster of which the inside, terminal, or uppermost flowers open first; a determinate cluster.
centripetal. From the outside in; as a flower-cluster of which the outer flowers open first; an indeterminate cluster.