Trees are the biggest plants with prominent woody trunks which usually give rise to branches above.
Among them include following:
(1) Caudex: Usually does not branch at all. The lateral buds on the tall columnar trunk are dormant or dead. On the top there is a crown of leaves. This is the habit of Palms. They may branch only abnormally. An unbranched stem like this may also be called columnar. (Fig. 87)
(2) Excurrent : In this the main stem grows indefinitely and the side branches develop in a strict acropetal order e.g. Polyalthia logifolia (Ashoka tree or Mast tree), Casuarina and Pine.
(3) Deliquescent : In this the tree is weaker than the strong lateral buds and very often, it is destroyed at some phase of its life so that the tree has a spreading habit as in banyans and many common trees. (Fig. 89.)