280 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



BETULA. 



B. lutea: fifty trees counted at Pierce's bridge; Middle bridge; 

 Spring Park. 



B. alba var. papyrifera : common at Pierce's bridge. 



Fagaceae. 

 QUERCUS. 



Q. alba: Old mill; South 7th street, Osage; Winona track. 

 Q. macrocarpa: common. 

 Q. rubra: Ryan farm; common. 

 Q. ellipsoidalis: Winona track; common. 



Q. veliitinaf : Ryan farm, two young trees that answer the 

 description very well. 



Urticacese. 

 ULMUS. 



U. fulva : common everywhere. 



U. americana: common everywhere. 



U. racemosa : South 12th street, Osage ; Spring Park. 



CELTIS. 



C. occidcntalis: river banks; Spring Park; river road. 



CANNABIS. 

 C, sativa : Middle bridge ; roadsides. 



HUMULUS. 

 H. Lupuhis: North 10th street. 



URTICA. 

 U. gracilis : Pelton's wood ; common. 



PILEA. 

 P. pumila: a common weed. 



Aristolochiaceae. 

 ASARUM. 



A. canadensc : common on banks of streams. 



Polygonaceae. 



RUMEX. 



R. patientia: Simpson farm in Lincoln township, 



R. crispiis: East Mechanic street, Osage; common along roadside. 



R. altissimus: two miles east of Osage. 



R. acetosella : common weed. 



