IN THE RESEARCH SERIES OF THE GRADUATE COLLEGE 



BULLETINS FROM THE 



LABORATORIES OF NATURAL 

 HISTORY 



Professor CHARLES C. NUTTING, Editor 



VOLUME VII NUMBER 3 



CONTENTS 



1 . The plant geography of the Lake Okoboji region: 



additional notes - - Bohumil Shimek 



2. The sand flora of Iowa ------ Bohumil Shimek 



3. A study of a red-eyed vireo's nest which contained a cowbird's 



egg .- - - - - - - - - -T. C. Stephens 



4. The pentatonoidea of the Lake Okoboji region - Dayton Stoner 



5. Cleistogamy in heteranthera dubia - - - - Robert B. Wylie 



PUBLISHED BY THE UNIVERSITY 



