2IO NATURAL HISTORY BULLETIN. 



CaRYA SULCATA + OLIVyEFORMIS. 



Muscatine Co. [Reppei't.) The fruit, though seemingly 

 well developed and showing characters of both species, 

 contains no seed. It seems undoubtedly a sterile cross 

 between the two species. 

 Carya amara JVult. 



Shelby Co. [Kitzpatrick) ; Lee and Johnson Cos. 



Betula nigra L. 



Des Moines Co. [Barisch); Polk Co. [E. Des Moines H. 

 ^V/zoo/) ; Johnson Co. Common. 

 Alnus incana Willd. 



Jones Co. {^Macbnde.') 

 Ostrya virginica Willd. 



Emmet Co. [Cratty); Winneshiek Co. [F'itzpatrick) ; Cal- 

 houn Co. [Rig-g); Lee and Johnson Cos. Very com- 

 mon near Iowa City. 



CaRPINUS CAROLINIAN a Walt. 



Emmet Co. [Cratty); Henry Co. [Mills); Lee Co. 

 [Bartsch) ; Johnson Co. 



QUERCUS MUHLENBERGII Eugclm. 



Lee, Jackson and Johnson Cos. 

 QuERCus palustris Du Roi. 

 Lee Co. 



QuERCUS IMBRICARIA Mx. 



Henry Co. [Mills); Des Moines Co. [Bartsch); Ringgold, 

 Washington and Johnson Cos. Found onl3Mn the south- 

 ern part of Johnson Co. 

 Salix amygdaloides Anders. 



Johnson Co. Quite common. 

 Salix longifolia Mtihl. 



Henry Co. [Mills); Winnebago, Lee and Johnson Cos. 

 Salix discolor Mahl. 



Johnson Co. Common. 

 Salix humilis Marsh. 



Henry Co. [Mills); Johnson Co. 



