Received for publication October 5, 1968. Published with the approval of the Director of the Hawaii Agricultural Experiment Station as Journal Series No. 1009. From a thesis submitted by the senior author in partial fulfillment of the requirement for the MS degree at the University of Hawaii.
Jr. Researcher, Lyon Arboretum, 3860 Manoa Rd., Honolulu and Associate Horticulturist, Department of Horticulture, respectively.