SOME UNUSUAL NATURAL AREAS IN ILLINOIS 
AND A FEW OF THEIR PLANTS 
This article has one main purpose: to acquaint 
interested persons with some unusual natural areas 
in Illinois. A natural area can be defined as an area 
of any size in which is found one or more rare spe- 
cies of plants or animals, an important biotic com- 
munity, a significant natural landscape, or some pre- 
historic condition that has been scarcely, or not at 
This paper is printed by authority of the State of 
Illinois, Che 127, IRS, Pare 58+12+¢ Dre Robert A. Evers 
is Associate Botanist, Illinois Natural History Surveys 
|. APPLE RIVER CANYON 
STATE PARK 
7. ILLINOIS RIVER 
SAND PRAIRIE 
8. TWIN CULVERT CAVE 
9. COLE CREEK HILL PRAIRIE 
13. FULTS HILL PRAIRIE 
14. FOUNTAIN BLUFF 
15. GRAND CANYON 
16. PINE HILLS and WOLF LAKE 
17, HORSESHOE LAKE 
18. CACHE RIVER SWAMPS 
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all, disturbed by the activities of man. This definition 
permits designation of certain localities in [Illinois 
as natural areas, although they may have been some- 
what disturbed by man. Such areas can be called 
scientific areas as well as natural areas, because 
they are valuable for certain types of research. 
Two centuries ago, most of what is now Illinois 
was scarcely touched by man. By 1900, however, our 
state had lost much of its forest land and most of the 
once vast flatland prairie. All of the big game ani- 
2. ILLINOIS BEACH 
STATE PARK 
3. VOLO BOG 
BOONE 
4. WAUCONDA BOG 
5. TROUT PARK 
n= 6. CLARK RUN 
J 
10. ROCKY BRANCH 
Hl. ILLINOIS CENTRAL 
RAILROAD PRAIRIE 
LAWRENCE 
Lf 12. DEVIL'S PROP 
24. LUSK CREEK CANYON 
23. HAYES CREEK CANYON 
22. BELL SMITH SPRINGS 
2!. JACKSON HOLLOW 
20. FORT MASSAC STATE PARK 
19. THORNTON'S RAVINE 
Fig. 2.-- Map of Illinois showing locations of natural or scientific areas described in this article. 
