Woody perennial

A plant that goes dormant in winter and begins growth in spring from above-ground stems. Related Images:

Woundwood

After wounding, callus forms, woundwood is a tough, woody tissue full of lignin that grows behind callus When woundwood closes wounds, then normal wood continues to form. Related Images:

Xylem

The principal water conducting tissue of vascular plants. Related Images:

Truss

A flower cluster, usually growing at the terminal of a stem or branch. Related Images:

Venation

The pattern of veins in leaves. Related Images:

Vascular system

The internal structure of the stem that transports water, minerals, and sugars throughout the plant. Related Images:

Vertical spacing

The vertical space between branches on a tree. Related Images:

Twig

A young stem (1-year-old or less) that is in the dormant winter stage (has no leaves). Related Images:

Trunk taper

The degree to which a tree’s stem or trunk decreases in diameter as a function of height above ground. Related Images: