356 VESTAL: A BLACK-SOIL PRAIRIE STATION 
species present; one is dominated by a number of grass species (the 
mixed consocies of mesophytic prairie-grass) ; and one is dominated 
by the large rosin-plant Silphium terebinthinaceum and by grasses. 
All of these three consocies are well developed in and near the 
county line prairie. The best area of the association seen is the 
mixed grass growth shown on the map near the left, adjoining the 
clover field; this has been mowed for hay each summer. The 
following species, mostly those of early summer, have been observed 
here: 
MIXED CONSOCIES OF MESOPHYTIC PRAIRIE- 
GRASS, COUNTY LINE 
| Equisetum arvense i Dodecatheon Meadia, h, ch 
f,ld Panicum Scribnerianum,ch li Asclepias tuberosa, x 
li Stipa spartea, x i Asclepias Sullivantu, h 
f, ld Sporobolus heterolepis, ch f Phlox glaberrima, ch 
i, ld Koeleria cristata lf Phlox pilosa, h 
i, ld Poa compressa, ruderal ? lf Monarda mollis 
| Bromus Kalmii, ch lf Pycnanthemum virgini- 
1 Elymus canadense anum, ch 
li Tradescantia reflexa i Castilleja coccinea, ch 
f Allium cernuum, ch If Pedicularis canadensis 
li Lilium canadense f Lobelia spicata, ch 
li Spiranthes cernua? li Solidago rigida, x 
li Polygonum sp. li Erigeron ramosus 
li Heuchera hispida i, la Antennaria plantaginifolia 
la Fragaria virginiana f, ld Silphium terebinthinaceum, ch 
i Amorpha canescens, x li Silphium integrifolium, x 
f Lathyrus palustris If Parthenium integrifolium, ch 
f Viola pedatifida, ch f Rudbeckia hirta, ch 
la Eryngium yuccifolium,h,ch i Cirsium Hillii, h, ch 
i Oxypolis rigidior, h i Krigia amplexicaulis, h, ch 
Another very rey tative station of practically the same kind 
of prairie is seen in a fenced-in triangular area at the intersection 
of the Illinois Central and Aurora, Elgin, and Chicago rights-of- 
way somewhat less than a third of a mile west of the Elmhurst 
station of the latter railroad. A tabulation of the plant population 
of an area about thirty feet square is here given. It was made 
August 18, 1913. 
