GRASSES OF IOWA 



155 



Sonora, upper and lower austral; oats, of the open panicle 

 type, American banner, transition; Welcome and Lincoln, 

 transition and upper Austral; red rust proof, upper and lower 

 Austral; oats with closed panicle, white Russian, transition 

 zone: black Tartarian, transition. 



Fig. 73. South American corn {Zea mays). Climate and the growth of maize. 

 failed to mature in Iowa. Had a large number of nodal roots. 



This 



Maize — Harshberger*, who has studied the various phases 

 of maize, presents an interesting meteorological table of various 

 points in Mexico for the months of April, May, June, July, 

 August, September and October, 1889. He introduced evidence 

 determining that it originated in Mexico, probable near Guadal- 

 jara, Leon and Pueblo. Leon is 5,400 feet above the level of 



«Malze: I.e. Contr. Bot. Lab. U. of Penn. 1: 75-302. pZ. i4-i7, 1893. 



