L. S. JordanDepartment of Botany and Plant Sciences, University of California, Riverside, CA 92521
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R. C. Russell
R. C. RussellDepartment of Botany and Plant Sciences, University of California, Riverside, CA 92521
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Contributor Notes
Received tor publication July 10. 1981.
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.