1Received for publication March 12, 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.
2Plant Breeder, Artichoke Research Association (Present address: USREP-JECOR, APO New York, NY 09038).
3Plant Geneticist, U.S. Dept. of Agriculture, Science and Education Administration-Agricultural Research.
4Extension Vegetable Specialist.
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