168 



two other stations have been found, at Mill Creek, in the same 

 county, and at Elco, Alexander County, located respectively 

 twenty and twenty-five miles south of the Pine Hills. The three 

 places are geologically similar, the underlying rock is the Clear 

 Creek limestone, and the soil is residual, without a deposit of 

 loess, which covers most of the southern Illinois hills. Since 

 the same geological formation extends over most of the area 

 between Elco and the Pine Hills it is very probable that other 

 scattered groves of the pine occur upon it. 



Lilium Catesbaci Walt, is reported from Jackson County by 

 Professor G. H. French. 



Casianca dcntata (Marsh.) Borkh. There is no published 

 record, in Patterson's Flora of Illinois or elsewhere, of the 

 growth of this species in the state. It is, however, undoubtedly 

 native in Pulaski County in the extreme southern part of the 

 state on the Ohio River. It appears to grow only in the heavy 

 clay soils of the Lafayette formation, and may occur in the ad- 

 jacent counties where the same formation is found. A photo- 

 graph sent by Mr. B. F. Gault represents a tree at least four, or 

 possibly five feet in diameter. 



Perilla frutescciis (L.) Britton. This Asiatic mint, first re- 

 ported from Illinois by Dr. Schneck,* is widely distributed over 

 the southern part of the state and extends north as far as Cen- 

 tralia. In some places it is one of the commonest roadside 

 weeds, growing in patches with AmaraJithus spiiiosits and Elcii- 

 sine Indie a. 



Hedconia hispida Pursh. On thin dry soil overlying limestone 

 ledges in Jackson County. 



Pentsteinon cajicsccns Britton. Steep dry rocky hillsides in 

 the Pine Hills, Union County. It also grows abundantly in 

 similar situations across the Mississippi in Perry County, Missouri. 



Houstonia lanccolata (Poir.) Britton. This species is reported 

 from several stations in central and southern Illinois, and extends 

 northward to Champaign County, in the east-central part of the 

 state. It grows in a variety of conditions. In Champaign 

 County it is found on the steep sides of clay bluffs with Hclian- 



*Cf. rollard. Hot. (Jaz. 21 : 233. 



