August, 1955 
was encountered in five prairies, where it 
grew also in the wooded coves. 
Lespedeza repens (L.) Bart. A few 
plants of creeping bush-clover were found 
in Sampson and Ursa hill prairies. 
X Lespedeza simulata Mack. & Bush. 
This species was collected from loess 
prairie at Renault and Fults, also on 
rocky prairie slopes of the latter. 
*Lespedeza stipulacea Maxim. Korean 
clover or lespedeza was seen in 13 hill 
prairies. At Rock Creek it had been 
planted; elsewhere it apparently was an 
escape from the nearby pasturelands. 
Lespedeza violacea (L.) Pers. Al- 
though usually found only in thickets and 
rocky woods, this lespedeza was seen in 
five prairies. It was more common, how- 
ever, in the nearby wooded coves than on 
the prairie slopes. 
Lespedeza virginica (L.) Britt. Slen- 
der bush-clover, a plant of woods, thick- 
ets, prairies, and glades, was seen growing 
in 18 prairie sites, from Clendenny and 
Richwood south to Government Rock 
and Cave Creek. 
* Medicago lupulina L. Black medic, 
a European species, was observed in East 
Henry and Mud Creek prairies. 
*Melilotus alba Desr. White sweet 
clover was seen in 25 hill prairies. It ap- 
peared to have been planted at Clendenny. 
It formed a very dense stand at Hidden 
Lake. 
*Melilotus officinalis (L.) Lam. Yel- 
low sweet clover was less frequent than 
white sweet clover; it was found at five 
prairie sites. 
Petalostemum candidum_ (Willd.) 
Michx. White prairie-clover was col- 
lected or observed at 19 prairie sites 
from Government Rock northward. It 
occurred abundantly in loess prairie at 
Homan, but at Phegley it was restricted 
to rocky wooded coves. 
Petalostemum purpureum  (Vent.) 
Rydb. Purple prairie-clover occurred in 
43 prairies from El] Rancho and Devil’s 
Backbone south to Government Rock. 
Psoralea tenuiflora Pursh. ‘The many- 
flowered psoralea occurred in 27 hill prai- 
ries from Valmeyer north to Ursa and 
Standard. In some sites it was the most 
conspicuous species in early summer. It 
is a distinctly western species and is very 
Evers: Hity Prairies oF ILLINoIs 431 
infrequent in Illinois other than in hill 
prairie. 
Robinia pseudo-acacia L. Black locust, 
not native in Illinois, has spread from nu- 
merous plantations and was seen in four 
loess prairies. 
Strophostyles helvola (L.) Ell. This 
wild bean of sand, rocky woods, or thick- 
ets was observed infrequently in seven 
hill prairies. 
Strophostyles leiosperma (T. & G.) 
Piper. This species was observed in two 
places, at Hill-Top and Rock Island 31. 
Stylosanthes biflora (L.) B.S.P. Pencil- 
flower, a plant of rocky woods and also 
glades, was collected at Fountain Bluff 
on both rocky and loess prairie slopes and 
at Sampson in loess prairie near a cove. 
Tephrosia virginiana (L.) Pers. 
Goat’s-rue, very common in the sand areas 
of Illinois, and occasional in dry, open 
woods with varying soil textures, was col- 
lected in a rock prairie at Government 
Rock, where it was abundant also in the 
woodland border, and in loess prairie at 
Oblate Fathers, Valmeyer, and Renault. 
LINACEAE 
Linum sulcatum Riddell. This annual 
flax was observed in loess and occasion- 
ally in stony soil in 28 hill prairies from 
Bielema and Magnolia south to Allen 
Lake. 
OXALIDACEAE 
Oxalis stricta L. Upright yellow wood- 
sorrel grew on rocky and loess prairie 
slopes at nine sites. It was found in crev- 
ices of ledges at two additional places. 
Oxalis violacea L. Violet wood-sorrel 
was found at 25 sites. In some places it 
blossomed in spring and again in early 
autumn. 
GERANIACEAE 
Geranium carolinianum L. This weedy 
cranesbill was seen in four hill prairies in 
southwestern Illinois. 
RUTACEAE 
Ptelea trifoliata L. Scattered small in- 
dividuals of wafer-ash grew in 11 hill 
prairies. This plant was more abundant 
in coves or on basal slopes of the bluffs 
than in the prairies. 
