August, 1955 



EvERS: HiLi. Prairiks of Im.inois 



429 



.intnione lirgiiiiana L. Tall anemone, 

 or thimbleweed. was seen on three Ur-ss 

 prairie slopes. 



Jquilegia 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 caroimianiun \ar. crispuin 

 Perry. Blue larkspur was collected at 

 Homan, Hidden Lake, and Sessions, 

 where it was growing in loess. 



Ranunculus iascicnlaris ^luhl. Tufted 

 or early buttercup was found in Balk and 

 Devil's Backbone prairies. 



Laur.ace.ae 



Sassafras albidum (Nutt.) Nees. Sassa- 

 fras occurred as small individuals on four 

 prairie slopes. 



Fl'mari.ace.ae 



Corydalis montana Engelm. [C. aurea 

 var. occidentalis Engelm.] This corydalis 

 of rocky woods, prairies, and glades 

 (Palmer i^ Ste>ermark 1Q35) 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 SunsefTrail. 



Draba reptans (Lam.) Fern. This 

 small, inconspicuous species of whitlow- 

 cress gre\v 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 densifloruni Schrad. This 

 introduced weed was seen in five of the 

 hill prairies visited. 



Lepidiuni lirtfinicuni L. Common pep- 

 pergrass, a weedy crucifer, was found in 

 three hill prairies. It was in places more 

 abundant in crevices of reck ledges at the 

 base of a prairie slope than in the prairie 

 itself. 



S.axifragaceae 



Heuchera richardsonii R. Br. Alum- 

 root was found in loess and on rocky 

 slopes of 13 hill prairies from El Rancho 

 to Cave Creek. 



Ribcs missouriensc Nutt. This com- 

 mon gouseberr), usually of woods and 

 thickets, occurred on the disturbed rock) 

 slope of Bielema prairie. 



ROSACEAE 



.liiriniitniti rostellata Wallr. Agrimony 

 was collected onl\ at Chaltin Bridge near 

 the woodland border ot one of the prairie 

 openings there. It is a plant that is usu- 

 ally found in woodlands. 



Jmelancliier 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. 



Crataeijus crus-t/alli 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 engehnanni Sarg. This haw- 

 thorn grew on the rock slopes at Cave 

 Creek. 



Crataegus mollis (T. 5c G.) Scheele. 

 Red haw, usually a small tree of thick- 

 ets and woodland borders, occurred in 

 Cave Creek prairie. 



Fragnria rirginiaiia Duch. Strawberry 

 was collected in loess at Bluff Springs, 

 Mud Creek, and Northeast Meredosia. 



Malus ioensis ( W^ood ) Britt. \_P\rus 

 ioensis (Wood) Bailey.] \Vild crab, or 

 Iowa 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 conuiion there. It is 

 probably more common in riatland prairie. 



