A small bundle or cluster, particularly of leaves, flowers, or vascular tissue.

Arranged in bundles or clusters, often referring to leaves or roots.

Having branches that are nearly parallel and erect, forming a narrow, column-like shape.

Trees with upright, narrowly spaced branches that grow close to the main trunk.

Honeycombed or pitted in appearance; having a structure resembling a honeycomb.

Lacking an inclusium, which is a protective covering of the sorus in ferns.

The outer layer of the wall of a pollen grain or spore, often sculptured and chemically resistant.

The outermost layer of the pericarp (fruit wall), often forming the skin of the fruit.

A plant that grows by adding new layers to the outside, typically referring to woody dicots with secondary growth.

Originating externally or from outside; in plants, refers to growth that occurs from outer layers such as the cambium.