August, 1955 
and in 2 rock prairies. It was found also 
in wooded coves nearby. 
VITACEAE 
Vitis spp. Stunted individuals of prob- 
ably four species of grape were found in a 
number of hill prairies. No fruiting vines 
were found in these hill prairies. 
HyYPERICACEAE 
*Hypericum perforatum L. Common 
St. John’s-wort was found in two loess 
prairies, Sunset Trail and Bluffs. 
Hypericum punctatum Lam. Spotted 
St. John’s-wort was observed in five hill 
prairies in central and southern Illinois. 
Hypericum  sphaerocarpum  Michx. 
Round-fruited St. John’s-wort was seen 
in five prairies. 
CISTACEAE 
Helianthemum bicknellii Fern. Frost- 
weed, a plant of sand prairie, rocky prai- 
rie, and glade, was found in sandy loess 
at Menominee Station and Sunset Trail. 
— Lechea leggettiu Britt. & Hollick. This 
pinweed was observed in loess at Menomi- 
nee Station. 
Lechea stricta Leggett. It was seen in 
hill prairie only at Valmeyer. 
Lechea villosa Ell. This species was 
encountered at Principia. 
VIOLACEAE 
Viola pedata L. Bird-foot violet was 
not found frequently. It grew on rocky 
slopes at Government Rock and in loess 
at Balk and Devil’s Backbone. 
Viola rafinesquii Greene. [V. kitaibeli- 
ana var. rafinesquii (Greene) Fern.]| 
Field or wild pansy, a plant of prairies, 
roadsides, glades, and waste places, oc- 
curred in five hill prairies. 
LOASACEAE 
Mentzelia oligosperma Nutt. Stick- 
leaf, or few-seeded mentzelia, fig. 28, 
grew chiefly in crevices of rock ledges; it 
grew also on rocky slopes above the ledges. 
It was collected on ledges at North Pan- 
darmie, Fults, and Phegley; on rock prai- 
rie, as well as ledges, at Seehorn-Payson, 
Sessions, South New Canton, Swarnes, 
and Valmeyer. It was not observed in 
the hill prairies between Swarnes and 
Evers: Hitt Prairies or ILLINoIs 
433 
Valmeyer, nor north along the bluffs east 
of the Bluff Hall railroad siding in Adams 
County. In Illinois it is apparently re- 
stricted to unglaciated bluffs or to those 
not glaciated since Kansan time. This 
genus is one of those of chiefly western 
distribution which reaches its eastern limit 
in exposed xeric habitats in western [Ili- 
nois. 
CACTACEAE 
Opuntia rafinesquii Engelm. [O. humi- 
fusa Raf.] The prickly pear was ob- 
served at 10 sites from Seehorn-Payson 
south to Phegley. It was found on rock 
ledges at Seehorn-Payson, Valmeyer, and 
Stotz; on rocky and loess slopes at Ses- 
sions, Housen, Chautauqua, Principia, 
Fults, Sampson, and Phegley. 
ONAGRACEAE 
Gaura biennis L. Biennial gaura, a 
plant of prairies, roadsides, and waste 
places, was collected in Seehorn-Payson, 
Reavis Spring, Bluff Springs, Valmeyer, 
and Fults prairies. 
Ocnothera biennis L. Common evening 
primrose was seen infrequently in eight 
hill prairies. 
Oenothera laciniata Hill. This evening 
primrose was found in 11 hill prairies in 
central and southern Illinois. 
UMBELLIFERAE 
Chaerophyllum sp. An unidentified spe- 
cies of this genus was found at Clen- 
denny. 
*Daucus carota L. Wild carrot was 
collected only at Phegley, where but few 
plants were found. 
Polytaenia nuttallii DC. Prairie-pars- 
ley was found growing in loess prairie 
and also at the border between prairie and 
rock ledges. It was collected at Reavis 
Spring, Chautauqua, Valmeyer, and 
Fults. 
Spermolepis inermis (Nutt.) Math. & 
Const. This umbellifer was found in 
loess prairie and on rock ledges at See- 
horn-Payson. 
Taenidia integerrima (L.) Drude. 
Taenidia, or yellow  pimpernel, was 
found on rocky slopes at Cave Creek. It 
was restricted principally to slopes with 
sparse cover, or to comparatively bare 
