TREES OP THE MISSOURI BASIN 
45 
SALICACE^ Willow Family. 
Salix amygdaloides Anders. Peach leaved Willow. Sioux 
City 17 (HBC), 2 (EST), Missouri Valley (HBC), Council 
Bluffs (HBC & LHP), Payne (HBC & LHP), Oto 29 (HBC), 
Whiting (LHP & HBC). Along streams. 
Balix (dha L. White Willow. Commonly cultivated in west- 
ern Iowa. Missouri Valley (HBC), Whiting (LHP & HBC). 
Salix habylomca L. Weeping Willow. Cultivated. Sioux 
City, Whiting, Missouri Valley. 
Salix cordata Muhl. Pussy Willow. Hamburg 37 (HBC & 
LHP), Sioux City (HBC), Whiting 5 (LHP & HBC). 
Salix fluviatalis Nutt. Sandbar Willow. Sioux City (HBC), 
Missouri Valley (HBC), Council Bluffs 51 (LHP & HBC), Oto 
29 (HBC), Whiting 36 (LHP & HBC), Payne 69 (HBC & 
LHP), Hamburg 43 (HBC & LHP). Common along streams 
and on sandbars. 
Salix missouriensis Bebb. Diamond Willow. Sioux City 8 
(HBC), 16, 17 (LHP & EST), Payne (LHP & HBC), Council 
Bluffs 20, 5 (LHP & HBC). 
Populus deltoides Marsh. Cottonwood. Sioux City (HBC) 
8, 14 (EST), Council Bluffs 52 (LHP & HBC), Missouri Val- 
ley (HBC), Whiting 10 (LHP & HBC). The cottonwood is 
common everywhere from Hawarden to Hamburg, not only in 
bottoms but in the ravines of the hills and on the bluffs. The 
P. Sargentii which is said to occur in Nebraska has not been 
found in Iowa. The cottonwood is an extremely variable tree. 
Near Hawarden on the Big Sioux one of us counted 160 annual 
rings on a cottonwood. Large trees five feet in diameter occur 
near Sioux City. 
Populus alba L. White Poplar, Abele. Commonly cultivated 
in western Iowa. Sioux City 16 (EST), Missouri Valley, Ham- 
burg, etc. Commonly spreads from suckers. 
Populus nigra Linn. var. italica Du Eoi. Lombardy Poplar. 
Commonly cultivated but not entirely hardy. Council Bluffs 
53 (LHP & HBC). 
Populus tremuloides Michx. Quaking Aspen. Eeported from 
Fremont and Mills counties by Von Bayer. However not repre- 
sented by specimens in the collection. This species occurs at 
Lake Okoboji, not, however, common. The Fitzpatricks record 
it from Einggold and Union counties. 
