Contributor Notes
Received for publication May 15, 1978 1977.
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.
2Research Botanist and Research Horticulturist, respectively. U.S. National Arboretum, U.S. Dept. of Agric., Science and Education Administration, Federal Research, North-eastern Region, Washington D.C. 20002.
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