Received for publication 19 Jan. 1988. We thank the Fred C. Gloeckner Foundation Inc. and the Washington State Bulb Commission for their interest and financial support for this research project. In most Dutch iris growing regions, the cultivar known in North America as ‘Blue Ribbon’ is called ‘Professor Blaauw’. Technical Paper No. 8420 of the Agricultural Experiment Station, Oregon State Univ., in cooperation with the Agricultural Research Service, U.S. Dept of Agriculture. Mention of a trade name or proprietary product, or vendor does not constitute a guarantee or warranty of the product by the USDA and does not imply approval to the exclusion of other products or vendors that may also be suitable. 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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