Dr. Green Thumb Identification

Tree, Plant, Flower & Insect Identification

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Ulmaceae
 

Celtis occidentalis - Hackberry
 Can get up to 60 feet tall.
 
 
  This tree is very adaptable to various site conditions; however, insects tend to be problematic.  Most Hackberries I've encounter are attacked by insects that cause tissues of the leaf to swell.  These swellings/bumps on the leaves are known as Leaf Nipple Galls which are caused by Psyllid insects.
 Mature bark has vertical corky rows which criss-cross.
 Leaves are simple and attached alternately.
 
  Base of leaves are uneven.
 
  Leaves are serrate except for at the base of the leaf.
 
  Fruit is called a drupe (berry) red to dark red.
 

Ulmus americana - American Elm
 This tree was the first Urban Tree introduced into Urban plantings and was severally over planted.
 
  A major reason American Elms have declined is due to Dutch Elms Disease.  The disease is vectored by way of beetle and kills the xylem in the tree making translocation of water impossible.
 
 
 The disease can also be transfered from neighboring American Elm Trees roots that have grafted together with an already infected American Elm.  This is why its best to diversify when planting.
 Leaves are simple and attached oppositely.
 
 
  Leaves are also serrate and veined pinnately.
 
  The undersides of the leaf feels like sand paper.
 
 

 Ulmus pumila - Siberian Elm
 Leaves are simple and alternately attached.
 
  Leaves are also serrated with small teeth, and the leaves are smaller then the American Elm.
 Up to 70 feet tall.
 
 
  One concern is damage from heavy snow and ice storms because of the outward spreading canopy.
 
Thick rows of bark with large areas of depressions between.  Light gray in color.  Rows may cross but don't form any type of pattern.