Issued February 15, 1909. 



United States Department of Agriculture, 



FOREST SERVICE Circular 64 (Revised). 



GIFFORD PINCHOT, Forester. 



FOREST PLANTING LEAFLET. SEP - 7 1914 



Division of Forestry 

 BLACK LOCUST (Robinia pseudaca<@%}i v ersity @f Californi 



FORM AND SIZE. 



The black locust (known also as " yellow locust," or often simply 

 " locust ") is a forest tree which usually attains a height of from 

 40 to 60 feet, with a diameter of from 1 to 1J feet. Under the most 

 favorable conditions it may reach a height of 80 feet and a diameter 

 of 3 feet. In the forest the tree has a clear, straight stem and a 

 small crown. In the open, or when grown in plantations, the stem 

 tends to divide early, and a more spreading and longer crown is 

 formed. Individual trees, especially when grown in the open, are 

 likely to be crooked or twisted. 



RANGE. 



The natural range of black locust is believed to have been restricted 

 to the Appalachian Mountains, from Pennsylvania to Georgia, and 

 to certain portions of Arkansas and eastern Indian Territory. The 

 tree reaches its best development on the western slopes of the 

 Appalachians in West Virginia. 



The introduced range is much larger. It includes the entire region 

 between the Atlantic Ocean and the Mississippi River, from southern 

 Canada to Florida, and extends west of the Mississippi south of the 

 thirty-eighth parallel as far as the Rocky Mountains. Black locust 

 has also been grown successfully in the valleys of Utah, Idaho, and 

 eastern Oregon and Washington when planted on irrigated land. 

 The black locust plantations in the vicinity of Salt Lake City, Utah, 

 and Walla Walla, Wash., are among the best in the United States, 

 and recent investigations indicate that it can be grown with success 

 in portions of California. Its actual range for economic planting, 

 however, is greatly restricted by the danger of insect injuries. 

 68220 Cir. 6409 



