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prairie and sumac. Ursa prairie was vis- 
ited August 11 and September 9, 1950; 
June 2 and July 14, 1951. 
Rock Creek.—Located north of Rock 
Creek, in the northwest quarter of sec- 
tion 25, T. 1 N., R. 9 W., Adams Coun- 
ty, this prairie when visited covered more 
than an acre of a ridge of sandy loess. 
Andropogon scoparius was the dominant 
grass; A. gerardi and Bouteloua curtipen- 
dula were present. Asclepias stenophylla 
and Chenopodium leptophyllum occurred 
in the interspaces. Psoralea tenuiflora 
was common on the gentle lower slope 
and the almost level top, but was infre- 
quent on the steeper slopes. Rock Creek 
prairie was visited September 8, 1949; 
August 11, 1950; April 25, June 2, and 
July 14, 1951. 
Homan.—This name, which is also 
the name of the creek to the east, here 
designates the small hill prairie that in 
1951 occupied slightly more than an acre 
in section 11, T. 1 S., R. 9 W., about 3 
miles north of Quincy. Prairie covered 
the west- and southwest-facing slopes of 
the southern tip of a ridge that ends at 
Homan Creek. The crest of the ridge 
was almost covered with Rhus glabra, 
Psoralea tenuiflora, Petalostemum can- 
didum, and Melilotus alba. A few indi- 
viduals of Asclepias stenophylla and Del- 
phinium carolinianum occurred there as 
well as on the slopes. Vegetation of the 
east-facing slope was principally a mix- 
ture of prairie and sumac. Andropogon 
scoparius dominated the west- and south- 
west-facing slopes. Bouteloua curtipen- 
dula occurred in scattered patches. This 
site was visited on April 25, June 2, and 
July 16, 1951. 
Parker Heights.—This small hill 
prairie, which occupied the south part of a 
ridge in Parker Heights, a park about a 
mile north of Quincy, Adams County, 
was visited May 28, 1950, and July 16, 
1951. Disturbed prairie, much trampled 
by people, covered the west- and south- 
west-facing slopes above the exposed 
limestone bedrock. 
Hidden Lake.—The pond within the 
quarry in the southeast quarter of sec- 
tion 23, T. 2 S., R. 9 W., about 2 miles 
south of Quincy, provided the name for 
this site. A wall of limestone which forms 
IttiNois NaturRAL History SuRVEY BULLETIN 
the north and east limits of the lake is 
covered with a thick mantle of loess to 
form the bluff. Above the bedrock, the 
mantle of loess forms an almost vertical — 
cliff with heights to 15 feet, and above 
the loess cliff is the gentle west- and 
southwest-facing brow slope of the bluff. 
Hidden Lake prairie, when visited Sep- 
tember 8, 1949, and May 28, July 2, Au- 
gust 13, and September 9, 1950, covered 
about 0.2 acre of this slope. The steep loess 
face was almost without vegetation except — 
at its junction with bedrock. Small shrubs 
occupied this junction. The prairie had 
been much disturbed by human tram- 
pling, because the site attracted numerous 
boys from nearby Quincy. Andropogon 
scoparius was dominant on the slopes. A 
dense stand of Rhus glabra, Melilotus 
alba, and A. scoparius occupied the crest 
of the ridge. Tridens flavus was fre- 
quent. 
Seehorn Cemetery.—This prairie, lo- 
cated on the uppermost slope of the bluff, 
in the southeast quarter of section 26, T. 
3 S., R. 8 W., Adams County, was vis- 
ited September 9, 1950. Prairie occupied 
the cemetery and some of the slope to the 
northwest and_ southeast. Downslope 
there was a mixed forest; upslope a bit of 
prairie was found between the cemetery 
and the cultivated upland. Sorghastrum 
nutans was the dominant grass. Andro- 
pogon gerardi, Bouteloua curtipendula, 
and Psoralea tenuiflora were common. 
Fall Creek.—This prairie in 1950 oc- 
cupied the bluff about one-quarter mile 
south of Seehorn Cemetery prairie. Mixed 
forest occupied the coves; forest, or a 
mixture of prairie and forest, covered the 
spurs. Andropogon scoparius, A. gerardi, 
and Sorghastrum nutans appeared equally 
abundant. Interspaces between the 
bunches of grass were small. This area 
was visited September 9, 1950. 
North Pandarmie.—This name des- 
ignates a group of spurs and coves on the 
bluffs in section 31, T. 3 S., R. 7 W., 
and section 36, T. 3 S., R. 8 W., north 
of Pandarmie Hollow, 2.5 miles south- 
east of Fall Creek, Adams County. 
When North Pandarmie was visited Sep- 
tember 9, 1950, forest occupied the coves; 
a mixture of prairie and forest covered 
the spurs. Andropogon gerardi and Sor- 
Vol. 26, Art. : 
