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American Journal of Botany 82(7): 944-953. 1995. INVITED SPECIAL PAPER THE ROLE OF HYBRIDIZATION IN EVOLUTION: OLD WINE IN NEW SKINS1'2 LOREN H. RIESEBERG Department of Biology, Indiana University, Bloomington, Indiana 47405 Perhaps no one has had a greater influence on the de- velopment ofhybridization theory than Dr. Ledyard Steb- bins. However, his contributions have not been restricted to his writings or lectures alone. Many of you have mar- veled at the great authority with which Dr. Stebbins iden- tified the hybrid status, parentage, and ploidal level of plants in the field or on herbarium sheets. He didn't seem to need all the modem techniques that the current gen- eration of botanists is both blessed and burdened with. For example, I remember a short field trip with Dr. Steb- bins in the fall of 1984 to look at some sunflower hybrids near Davis. The plants were dead, only a few dried leaves, stalks, and floral heads remained, yet he confidently iden- tified parental, hybrid, an...