LITERATURE CITED 
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Cutler, H. C., and M. C. Cutler, 1948. Studies on the structure of 
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Esau, K., 1943. Ontogeny of the vascular bundle in Zea Mays. Hil- 
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Galinat, W. C., 1954a. The origin and possible evolution of sub-tassel 
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——,, 1954b. Corn grass II. Effect of the corn grass gene on the de- 
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——,, 1956. Evolution leading to the formation of the cupulate fruit 
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——,, 1957. The effects of certain genes on the outer pistillate glume 
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Laubengayer, R. A., 1948. The vascular anatomy of the four-rowed 
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