Affiliation: | Department of Botany, Faculty of Science, Kyoto University, Kyoto 606-01, and Institute of Genetic Ecology, Tohoku University, Sendai 980, Japan;Laboratory of Plant Genetics and Evolution, Faculty of Agriculture, Hokkaido University, Sapporo 060, Japan;Section of Botany, Carnegie Museum of Natural History, Pittsburgh, PA 15213, U.S.A. |