TREES OF THE MISSOURI BASIN 
27 
Name of Species 
Shimek — Lyon & 
Sioux Counties 
O g 
oj O 
SO 
Jj o 
S § 
03 Q 
Macbride — Cherokee & 
Buena Vista Counties 
o "w 
03 o 
If 
So 
|o3 
gs 
Shimek— Harrison & 
1 Monona Counties^o 
Pammel— Harrison, Mono- 
na, Woodbury Counties 
Fitzpatrick— 
Fremont County 
Fitzpatrick— 
Pottawattamie County 
Von Bayer— 
Fremont County 
Sambucus canadensis 
+ 
+ 
' + 
+ 
+ 
+ 
' + 
+ 
Smilax rotundifolia 
“h 
4- 
+ 
+ 
Shepherdia argentea 
-h 
Symphoricarpos occidentalis . . . 
+ 
+ 
+ 
. + 
+ 
+ 
+ 
Symphoricarpos orbiculatus . . . 
+ 
Tilia americana 
+ 
+ 
+ 
.+ 
+ 
+ 
+ 
+ 
Ulmus americana 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
Ulmus fulva 
+ 
+ 
+ 
+ 
+ 
+ 
+ 
Ulmus Thomasii 
+ 
+ 
Virburnum Lentago 
-j- 
+ 
+ 
Viburnum prunifolium 
H- 
Vitis cinerea 
-h 
Vitis vulpina 
+ 
•f* 
+ 
+ 
+ 
-U 
Zanthoxylum americana 
+ 
■ + 
+ 
+ 
+ 
TOPOGRAPHY OP THE REGION. 
The area included in this survey is drained towards the 
Missouri river and includes the region chiefly between Sioux 
City, Sioux Eapids on the north and Hamburg and Payne on 
the south. The ecological distribution of trees was studied more 
particularly in the counties of Fremont, Harrison, Buena Vista 
and ’Woodbury. The topography of the region, especially along 
the Missouri, is characterized by the wind swept hills or loess 
hlulfs which border the bottom lands of the Missouri. The ex-» 
posed bluffs contain few trees; towards the east, the hills are 
less abrupt and wind swept and consequently more trees oceur. 
The region is traversed by the following streams. Big Sioux, 
Floyd, Little Sioux, Soldier, Boyer, Nishnabotna and many 
smaller streams like Pigeon, Mosquito and Keg creeks. 
Shimek in the Geology of Lyon and Sioux counties by Frank A. Wilder. 
Rep, la. Geol. Survey 10: 157-184. Bull. Lab. Nat. Hist. State Univ. of Iowa 
5: 215. 
i®T. H. Macbride. Under the head of forestry notes of Osceola and Dickin- 
son counties. Rep, la. Geol. Survey 10: 228-239, 
H. Macbride. Geology of Sac and Ida counties. Forestry notes. Op. 
cit., 16: 549-562. Part of the trees of these counties belong to the Missis- 
sippian flora. 
20B, Shimek. Geology of Harrison and Monona counties. Botanical Report. 
Rep. la. Geol. Survey 20: 426-485, pi. 26-S9.- Shimek lists the Geltis occidentalis 
as var. crassifoKa. 
