10 



GRASSES OF IOWA. 



Soft corn, Zea amylacea. Stur. Bull. Torr. Bot. Club. 1894: 331. 

 Sweet corn, Zea saccharata. Stur. Bull. Torr. Bot. Club. 1894: 333. 

 Zea amyleasaccharata, Stur. Rep. Geneva, N. Y. Agrl. Exp. 1886: 66. 



The so-called species and groups of Doctor Sturtevant are hardly 

 to be regarded as varieties. Some of the forms under conditions of cul- 

 ture and climate, revert to their original type. They are certainly not 



Fio. 4. a and b, Zea canina, grown at Knoxville, Tenn. (U. 8. Dept. Agrl. ) 



to be regarded as varieties. A plant cultivated for so long a time by 

 the Indians and civilized man has naturally given rise to diverse forms. 

 We regard them as nothing more than races of the very polymorphic 



species Zea mays. 



ZEA CANINA. 

 Zea canina Watson. Proc Am. Acad. Arts & Sci. 26: 160. 



