August, 1955 
Anemone virginiana L. Tall anemone, 
or thimbleweed, was seen on three loess 
prairie slopes. 
Aquilegia canadensis L. Wild colum- 
bine was found under a red cedar grow- 
ing in loess at North Savanna. It was 
frequent on some rock ledges and in ad- 
jacent rocky woods. 
Delphinium carolinianum var. crispum 
Perry. Blue larkspur was collected at 
Homan, Hidden Lake, and _ Sessions, 
where it was growing in loess. 
Ranunculus fascicularis Muhl. Tufted 
or early buttercup was found in Balk and 
Devil’s Backbone prairies. 
LAURACEAE 
Sassafras albidum (Nutt.) Nees. Sassa- 
fras occurred as small individuals on four 
prairie slopes. 
FUMARIACEAE 
Corydalis montana Engelm. [C. aurea 
var. occidentalis Engelm.] ‘This corydalis 
of rocky woods, prairies, and _ glades 
(Palmer & Steyermark 1935) was found 
in the Valmeyer prairie. 
CRUCIFERAE 
Arabis lyrata L. This species of rock- 
cress occurred in loess at North Savanna 
and Balk, and on rock ledges at Menom- 
inee Station and Sunset Trail. 
Draba reptans (Lam.) Fern. This 
small, inconspicuous species of whitlow- 
cress grew in interstices at eight hill prai- 
rie stations. 
*Lepidium campestre (L.) R. Br. Field 
peppergrass, or cow-cress, was seen in hill 
prairie only at Devil’s Backbone. 
*Lepidium densiflorum Schrad. ‘This 
introduced weed was seen in five of the 
hill prairies visited. 
Lepidium virginicum L. Common pep- 
pergrass, a weedy crucifer, was found in 
three hill prairies. It was in places more 
abundant in crevices of rock ledges at the 
base of a prairie slope than in the prairie 
itself. 
SAXIFRAGACEAE 
Heuchera richardsonii R. Br. Alum- 
root was found in loess and on rocky 
slopes of 13 hill prairies from El Rancho 
to Cave Creek. 
Evers: Hitt Prairiss oF ILLinots 
429 
Ribes missouriense Nutt. This com- 
mon gooseberry, usually of woods and 
thickets, occurred on the disturbed rocky 
slope of Bielema prairie. 
ROSACEAE 
A grimonia rostellata Wallr. Agrimony 
was collected only at Chalfin Bridge near 
the woodland border of one of the prairie 
openings there. It is a plant that is usu- 
ally found in woodlands. 
Amelanchier arborea (Michx.  f.) 
Fern. Serviceberry, usually of wooded 
hillsides, was observed on the rock-strewn 
slopes at Government Rock and Foun- 
tain Bluff. It was seen in crevices and 
clefts in rock ledges near other hill prai- 
ries. 
Crataegus crus-galli L. Cockspur-thorn 
was found on stony slopes at Cave Creek 
and in loess at Mud Creek and Pere Mar- 
quette. In these localities and in others 
it was found also in the woodland bor- 
ders. 
Crataegus engelmanni Sarg. This haw- 
thorn grew on the rock slopes at Cave 
Creek. 
Crataegus mollis (T. & G.) Scheele. 
Red haw, usually a small tree of thick- 
ets and woodland borders, occurred in 
Cave Creek prairie. 
Fragaria virginiana Duch. Strawberry 
was collected in loess at Bluff Springs, 
Mud Creek, and Northeast Meredosia. 
Malus ioensis (Wood) Britt. [Pyrus 
ioensis (Wood) Bailey.] Wild crab, or 
lowa crabapple, was found as seedlings in 
six hill prairies. In the coves it was more 
frequent and the plants were larger than 
in the prairie areas. 
Potentilla arguta Pursh. The tall cin- 
quefoil grew on stony or loess slopes of 
nine hill prairies in northern Illinois. 
Potentilla simplex Michx. Common or 
old-field cinquefoil was found only at 
Sunset Trail, in loess. 
Prunus lanata (Sudw.) Mack. & Bush. 
[P. americana var. lanata Sudw.] This 
wild plum was found in rock prairie at 
Cave Creek. At other sites, if present, it 
occurred in the woodland border. 
Rosa carolina L. The pasture rose was 
found in rock prairie or in loess prairie at 
12 sites. It was not common there. It is 
probably more common in flatland prairie. 
