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Science 29 August 2003:
Vol. 301. no. 5637, pp. 1189 - 1190
DOI: 10.1126/science.1089292
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Perspectives

Also see the archival list of Science's Compass: Enhanced Perspectives

EVOLUTION:
Enhanced: Sex, Sunflowers, and Speciation

Richard J. Abbott

Matings between different species (interspecific hybridization) provide increased genetic variation and new gene combinations that could be a potent force in adaptive evolution and the production of new species. As Abbott explains in his Perspective, evidence for this has so far been scant, but is now provided by new work on interspecific hybridization in sunflowers (Rieseberg et al.).

The author is at the School of Biology, University of St. Andrews, Fife KY16 9TH, UK. E-mail: rja{at}st-and.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)