E. M. NauerDepartment of Botany and Plant Sciences, University of California, Riverside CA 92521
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S. B. Boswell
S. B. BoswellDepartment of Botany and Plant Sciences, University of California, Riverside CA 92521
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Contributor Notes
Received for publication August 22, 1980.
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.
The authors gratefully acknowledge the assistance of L. L. Summers for statistical analyses.