EXPLANATION OF THE ILLUSTRATION 
Prate IX. The outer pistillate glume of maize, as 
effected by various genes. Left and right speci- 
mens show dorsal and ventral views. 1, papyres- 
cent (Pn); 2, tunicate (Tu); 3, normal; 4, ves- 
tigial glume (Vg). Twice natural size. 
Photograph by Frank Wuire 
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