56 Bulletin of the Unversity of Texas 
trunk. Leaf with flattened petiole, blade about 114’-5’ long 
and almost as wide, coarsely toothed, teeth ineurved, gland- 
ular, veins prominent on both surfaces. Flowers borne in 
eatkins appearing before the leaves. The staminate catkins 114’ 
long, the nvistillate 114’-2’ long before the fruit ripens, becom- 
ing 3’-4’ long as the fruit develops. 
Quebee to Florida and west to the Rocky Mountains. It 
grows in moist soils aiong 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 Watson. Cottonwood. A tree 100° 
in height and 5°-6° in diameter with a rather broad, open 
erown 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 or 
reinform, 2’-214’ long, 214’-3’ broad. Coarsely serrate, with 
4-12 ineurved 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 
