56 Bulletin of the University of Texas 



trunk. Leaf with flattened petiole, blade about l%'-5' long 

 and almost as wide, coarsely toothed, teeth incurved, gland- 

 ular, veins prominent on both surfaces. Flowers borne in 

 catkins appearing before the leaves. The staminate catkins 1%' 

 long, the pistillate l%'-2' long before the fruit ripens, becom- 

 ing 3'-4' long as the fruit develops. 



Quebec to Florida and west to the Rocky Mountains. It 

 grows in moist soils along lakes and streams. 



The wood is principally sap wood which is light, soft, and 

 weak. It warps badly, and is dried only with difficulty; used 

 principally for box boards, siding, sheeting, excelsior, and 

 pulp. The supply has been almost exhausted. The cotton- 

 wood is sometimes planted as an ornamental tree, but this is 

 to be recommended only where a quick growing shade, or 

 windbreak must be had at the sacrifice of more desirable slower 

 growing varieties. 



3. Populus Fremontii W-atson. Cottonwood. A tree 100 

 in height and 5-6 in diameter with a rather broad, open 

 crown and short trunk. Bark on young branches, light gray 

 brown, thin and smooth; on older parts, thick, dark brown 

 with reddish tinge, and deeply fissured. Leaves deltoid qr 

 reinform, 2 / -2 1 /_/ long, 2 1 /^ / -3 / broad. Coarsely serrate, with 

 4-12 incurved glandular tipped teeth on each side. 



A western form extending from California eastward to 

 Nevada, and south to Texas. It occurs along water courses 

 throughout the western part of the state. 



Its uses are similar to Populus deltoides. 



4. Populus Wislizeni Sarg. Cottonwood. Occurs in the 

 valley of the Rio Grande from El Paso to the Gulf. It is dis- 

 tinguished from P. Fremontii by the greater length of the 

 flower pedicel, and the more sharply pointed leaves. 



2. SALIX L. Willow. 



Trees or shrubs with soft wood, simple, alternate leaves 

 which are elongated, pointed, deciduous, without lobes, usually 

 serrate. Flowers in catkins appearing before or with the 

 leaves. Staminate and pistillate flowers borne upon different 

 trees. Fruit a dehiscent capsule containing many seeds which 



