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By: Rieseberg, Loren H - Allan, Gery J - Bui, Yen - Greene, Julie - Morrell, Peter L - Spencer, Stanley C - O'brien, BartType: ArticleIn: Madroño; a West American journal of botanyVolume: 41Series:Issue:Date: 1994Page Range: 30--38Publication Info: Berkeley California Botanical SocietySubjects: