434 



Illinois Natural History Survev Bulletin Vol. 26, Art. 5 





Fig. 28. — Mentzelia oligosperma growing in thin loess just above a limestone clii?, south of 

 New Canton, Pike County. 



spaces just above or just below slopes. 

 Presumably it cannot compete with vig- 

 orous species. 



*Torilis japonica (Houtt.) DC. 

 Hedge-parsley was found in hill prairie 

 only at Chautauqua. This species seem- 

 ingly is becoming widespread in Illinois. 



Zizia aurea (L.) Koch. Golden alex- 

 anders, a plant of both prairie and forest, 

 grew in the rock prairie at Cave Creek. 



CORNACEAE 



Cortnis drumtnond'i Meyer. This dog- 

 wood, common in thickets and in wood- 

 land borders, was observed growing singly 



or in small thickets in loess prairie at 19 

 sites. It was common also in the adjoin- 

 ing coves. 



Cornus ftorida L. Scattered individuals 

 of flowering dogwood, a very attractive 

 plant in springtime, were seen in Swarnes 

 and Cave Creek prairies. 



Ericaceae 



Vaccinlum arboreum Marsh. Farkle- 

 berry, or tree huckleberry, a plant of 

 rocky woods, was collected in rock prairie 

 at Government Rock. 



Vaccinium vacillatis Torr. Hill or low 

 blueberry, a species of rocky woods, bluffs. 



