2io NATURAL HISTORY BULLETIN. 



CARYA SULCATA + OLIV^FORMIS. 



Muscatine Co. [Reppcrt.) 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. 

 Carva amara Nutt. 



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

 Betula nigra L. 



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

 School} ; Johnson Co. Common. 

 Alnus incana Willd. 

 Jones Co. [Macbndc.) 



OSTRYA VIRGINICA Willd. 



Emmet Co. (Cratty); Winneshiek Co. [Eitzpatrick) ; 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 Engclm. 



Lee, Jackson and Johnson Cos. 

 Quercus palustris Da Roi. 



Lee Co. 

 Quercus imbricaria Mx. 



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

 Washington and Johnson Cos. Found only in the south- 

 ern part of Johnson Co. 

 Salix amygdaloides Anders. 



Johnson Co. Quite common. 

 Salix longifolia MuhL 



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

 Salix i hscolor MuhL 



Johnson Co. Common. 

 S \li\ ihmilis Marsh* 



Henry Co. (Mills); Johnson Co. 



