§ 150.771 SIZES AND TYPES OF PROTECTED, HERITAGE AND ANCESTRAL TREES.
   (A)   Protected tree.
      (1)   Protected trees are those with a diameter of ten inches or more, measured four and one-half feet above natural grade for the majority of large tree species. A tree with a diameter greater than five inches of the following small tree species shall be considered protected:
         (a)   Texas Persimmon (Diospyrus texana);
         (b)   Texas Mountain Laurel (Sophora secundiflora);
         (c)   Eve's necklace (Sophora affinis);
         (d)   Silk Tassel (Garrya ovata); and
         (e)   Big Tooth Maple (Acer grandentatum).
      (2)   In addition trees of all species that meet the size requirements in division (A)(1) of this section are protected except the following species of trees:
         (a)   Chinaberry (Melia azederach);
         (b)   Chinese Tallow (Sapium sebiferum);
         (c)   Japanese Ligustrum (Ligustrum japonica);
         (d)   Tree of Heaven (Ailanthus altissima); and
         (e)   Callery Pear (Pyrus calleryana).
   (B)   Heritage tree.
      (1)   Any tree with a diameter of 24 inches or more, measured four and one-half feet above natural grade, and is one of the following species:
         (a)   Texas Ash (Fraxinus texensis);
         (b)   Bald Cypress (Taxodium distichum);
         (c)   American Elm (Ulmus americana);
         (d)   Cedar Elm (Ulmus crassifolia);
         (e)   All Oaks (Quercus sp.);
         (f)   Pecan (Carrya illinoinensis);
         (g)   Arizona Walnut (Juglans major);
         (h)   Eastern Black Walnut (Juglans nigra);
         (i)   Honey Mesquite (Prosopsis gladulsis); and
         (j)   Ashe Juniper (Juniperus asheii) with no more than two main trunks.
      (2)   In addition, heritage tree means a tree that has a diameter of ten inches or more, measured four and one-half feet above natural grade, and is one of the following species:
         (a)   Texas Persimmon (Diospyrusfexono);
         (b)   Texas Mountain Laurel (Sophora secundiflora);
         (c)   Eve's necklace (Sophora affinis);
         (d)   Silk Tassel (Garrya ovata); and
         (e)   Bigtooth Maple (Acer grandidentatum).
      (3)   This list of eligible heritage tree species may be supplemented.
   (C)   Ancestral tree. Any tree listed on the heritage tree list that has reached a diameter of 30 inches or more for the large tree category or 15 inches or more for the small tree category.