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Received for publication 23 Apr. 1987. We acknowledge the assistance of Bonnie Dee, Judy Kozlowski, Geoff May, and Allison Pritts in harvesting plots and collecting data, and are grateful to Susan Brown, James Hancock, Marcia Eames-Sheavly, and Gene Oberly for their helpful reviews. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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