Large trees will typically exceed 10 to 15 meters in height when fully grown. The diameter of a mature tree will almost always be greater than 20 cm at breast height. Seedling and saplings may resemble shrubs or small trees in size or form.

At maturity, small trees are generally between 5 and 15 meters in height. They are more likely than shrubs to have a single primary trunk with a diameter between 10 and 25 cm at breast height. Young trees will often have the proportions and characteristics of mature shrubs.

For the purposes of this listing, shrubs are considered self-supporting woody plants which at maturity are generally less than 3 to 5 meters in height. They often have multiple stems, none exceeding about 10 cm in diameter at breast height.

As with all artificial distinctions, exceptions to these definitions are to be expected.