248 ILLINOIS ACADEMY OF SCIENCE 



panying the report just cited and the following notes 

 on species distribution may be regarded as an appendix 

 to that paper. Collections were made of certain of the 

 oaks of which 8 species were found within the county. 

 Special attention was given to the black oaks Quercus 

 velutina and Q. ellipsoidalis and to one or two other 

 species of rare occurrence. Material of these collec- 

 tions, bearing the collection numbers, have been placed 

 in the herbaria of the University of Illinois, at Urbana 

 and of the Field Museum of Chicago. No attempt at 

 completeness has been made but it is thought that the 

 following notes may be worthy of record. 



1. Quercus alha L,, white oak. This species is found 

 in all the upland forests often forming 40 to 60 per cent 

 of the present stand. 



2. Q.macrocarpa MicJix., bur oak. This oak also oc- 

 curs throughout the county in the upland forests and is 

 rather abundant upon the drier flood plains. A form 

 collected in Earl Township, Sect. 17, No. 1128, showed 

 a particularly small acorn, another collection, No. 1117, 

 was made in Earl Township, Sect. 8, and a third, No. 

 1109, in La Salle Township, Sect. 25, upon a stream ter- 

 race. 



3. Q. hicolor Willd., swamp white oak. A single small 

 stand of this species was found in Dimmick Township, 

 Sect. 3, upon the flood plain of Vermilion Creek, Col- 

 lection No. 1162. 



4. Q. Miihlenbergii Engelm., yellow chestnut oak. The 

 species is not abundant, forming a very small per cent 

 of the stand and is apparently confined to the uiDlands 

 near the Illinois and Fox Rivers. Collections : Peru 

 Township, Sect. 19, No. 1133; La Salle Township, Sect. 

 11, No. 1134 and Dayton Township, Sect. 4, No. 1160. 



5. Q. rubra L., red oak. Found throughout the county 

 upon somewhat sheltered slopes, in ravines and upon the 

 uplands most advanced in mesophytism. 



6. Q. velutina Lam., black oak. This is the principal 

 element forming the more xerophytic upland forests. 

 It is abundant in Starved Rock Park and was collected 

 in the following townships: Earl, No. 1126, and Serena 



