Received for publication Oct. 21, 1968. Journal Paper No. 3387. Agricultural Experiment Station, Purdue University, Lafayette, Indiana.
Portion of a thesis presented to the faculty of the Graduate School of Purdue University, by the senior author, in partial fulfillment of the requirements for the PhD degree. Supported by the Purdue Research Foundation, Grant 4071.
Present Address: Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, New York 14850.
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