428 
was seen in hill prairie at Sunset Trail 
and Ursa. 
Ostrya virginiana (Mill.) K. Koch. 
American hop-hornbeam was found on 
four rocky prairie slopes and also on one 
loess slope. It was usually one of the trees 
found in wooded coves. 
FAGACEAE 
Quercus alba L. White oak saplings 
or small trees were observed in loess prai- 
rie at Sunset Trail, Hill-Top, and Foun- 
tain Bluff. 
Quercus macrocarpa Michx. At Dev- 
il’s Backbone and Ursa a few saplings of 
bur oak were found in the prairie. There 
and at other sites it was found also in 
the coves. 
Quercus marilandica Muenchh. Black 
jack was represented by a few stunted in- 
dividuals in the rock prairie at Govern- 
ment Rock. 
Quercus muhlenbergii Engelm. Yellow 
or chinquapin oak occurred in 10 prai- 
ries. It was more abundant in clefts of 
limestone ledges, in coves, and on lower 
bluff slopes than in prairies. 
Quercus stellata Wangh. Post oak oc- 
curred as scattered individuals in seven 
prairies. It was common in woodland 
borders in southwestern Illinois. 
Quercus velutina Lam. Black oak, like 
other oaks a woodland species, was found 
in seven prairies, usually in the borders 
between prairie areas and upland woods, 
and occasionally as small solitary trees on 
the prairie slopes. 
ULMACEAE 
Celtis laevigata Willd. Sugarberry, a 
southern tree, most frequent in bottom- 
lands, was represented by one specimen in 
rock prairie at Government Rock. 
Ulmus alata Michx. Winged elm was 
found on the stony prairie slopes at Foun- 
tain Bluff, Government Rock, and Cave 
Creek. 
Ulmus rubra Muhl. Very small indi- 
viduals of slippery elm were found in 
eight hill prairies. 
MorACEAE 
Maclura pomifera (Raf.)  Schneid. 
Osage orange was observed in the pas- 
tured loess prairie at Walnut Creek and 
ILtinois NATURAL History SuRVEY BULLETIN 
Vol. 26, Art. 5 
also in the prairie near woodland at Prin- 
cipia. In some other localities it was abun- 
dant in pastured woods on the basal slopes 
of bluffs. 
CANNABINACEAE 
*Cannabis sativa L. Common hemp, 
abundant in some pastured sand areas of 
Illinois, was seen at South New Canton, 
a pastured hill prairie. 
SANTALACEAE 
Comandra umbellata (L.) Nutt. [C. 
richardsiana Fern.] Bastard-toadflax was 
found on 13 loess and 7 rocky prairie 
slopes from El Rancho and Devil’s Back- 
bone south to Renault. 
POLYGONACEAE 
Polygonum tenue Michx. Slender 
knotweed was collected from the rocky 
prairie slopes and the sandstone ledges at 
Fountain Bluff. 
(CHENOPODIACEAE 
Chenopodium leptophyllum Nutt. [C. 
pratericola Rydb.] The narrow-leaved 
goosefoot was found in sandy loess at 
Balk and Rock Creek. 
NYCTAGINACEAE 
Mirabilis nyctaginea (Michx.) MacM. 
Umbrella-wort was found in only one hill 
prairie, Devil’s Backbone. 
CARYOPHYLLACEAE 
Cerastium nutans Raf. Nodding mouse- 
ear chickweed occurred in Valmeyer and 
Fountain Bluff prairies. 
*Cerastium vulgatum L. Common 
mouse-ear chickweed was found in loess 
at Seehorn-Payson. 
*Saponaria officinalis L. Bouncing-bet 
was found in loess at Homan. 
Silene antirrhina L. Sleepy catchfly 
was observed in nine rock or loess prairies — 
and in crevices of rock ledges at the bases 
of four prairies. . 
RANUNCULACEAE 
Anemone canadensis L. Meadow anem- ~ 
one was found in Bielema hill prairie. 
Anemone cylindrica Gray. The long- 
fruited anemone occurred in 14 hill prai- 
ries, mostly in loess. 
