Excerpt from Torreya, Vol. 3
During several collecting trips to southern Illinois the writer has been able to make field notes on a number of rare or interesting species. The flora of the extreme southern part of the state is essentially different from that of the central and northern portions, in that the austro-riparian flora finds there its northern limit, and the unglaciated hills and vertical cliffs afford edaphic conditions unlike anything else in Illinois. Consequently, some three hundred species of the Illinois flora are confined to that region.
The only station in Illinois for Finns echinata Mill, is a small area in Union County locally known as the Pine Hills. The soil there is thin and rocky, and underlaid by Silurian limestone. Erosion has cut deep ravines with steep rocky sides and sharp narrow crests. These hills reach a height of four hundred feet above the adjoining bottoms of the Mississippi River, or about seven hundred and fifty feet above sea level. Along the narrow crests of these hills the pines are growing, in company with hickory and scrub oak. Some of the largest specimens are three feet in diameter and eighty feet high. Along the sides of the hill their growth is stunted, and none is found more than a hundred feet from the crest. Cones are produced abundantly, and healthy seedlings are common.
Along the steep rocky hillside below the pines is the only station in Illinois for the pink azalea, Azalea nudiflora L. The shrubs are usually from three to six feet high, and are fairly abundant.
Manuals give but two stations for Phlox Stellaria Gray - the cliffs of the Kentucky River and southern Illinois.
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