﻿12 BULLETIN 24, U. S. DEPARTMENT OF AGRICULTURE. 



SILVICAL CHARACTERISTICS. 



DEMANDS UPON SOIL AND MOISTURE. 



Cottonwood requires abundant soil moisture. It is not adapted 

 to dry situations, such as ordinary upland sites with thin soil. It 



Fig. 1. — Catkins, twigs, and leaf and flower buds of cottonwood. a, Pistillate catkin ; b, 

 enlarged scale of staininate catkin ; c, staminate catkins ; d, twig with leaf -buds ; e, 

 twig with flower-buds ; /, twig, showing angularity ; g, longitudinal section of leaf-bud ; 

 h, longitudinal section of flower-bud. 



seldom establishes itself naturally where surface moisture is lacking, 

 although, if planted on such sites, it frequently makes very satis- 



