51 



Fig-. 14. Black Hills spruce trees on upland soil. These trees are between 

 30 and 40 years old and have a height of about 30 feet. 



in growth and produce a product of equal or greater value. 



For ornamental planting the Black Hills spruce is impor- 

 tant for dry, exposed situations. 



WHITE CEDAR (ARBORVITAE) ( Thuja occidentalis) 



The Tree : In the United States the arborvitae or white 

 cedar is native from the northeastern part of the country to 

 central Minnesota. It is generally found in the so-called 

 "cedar swamps" or on moist situations. Wellj developed 

 trees in the open have a beautiful pyrmidal crown. The 

 leaves are very small and are arranged in broad flat sprays. 

 In central Iowa upland grown trees are very slow in growth 

 and before reaching an appreciable size gradually die out. In 



