Received for publication, August 19, 1978.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Research Horticulturist, U.S. National Arboretum, U.S. Department of Agriculture, Science and Education Administration, Federal Research, Washington, D.C. 20002.
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