Received for publication June 30, 1968, contribution number 1281, Rhode Island Agricultural Experiment Station, Kingston, R. I. Work submitted by senior author in partial fulfillment of the PhD in Biol. Sci., Botany Dept., University of Rhode Island, Kingston.
Assistant Prof, of Horticulture, Assoc. Prof, of Botany, and Professor of Horticulture, respectively.
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