Indiana University paleobotanist David Dilcher and colleagues in Europe have identified a 125 million- to 130 million-year-old freshwater plant as one of earliest flowering plants on Earth. The finding, reported Aug. 17 in the Proceedings1 of the National Academy of Sciences, represents a major change in the presumed form of one of the planets earliest flowers, known as angiosperms.This discovery raises significant questions about the early evolutionary2 history of flowering plants, as well as the role of these plants in the evolution of other plant and animal life, said Dilcher, an emeritus3 professor in the IU Bloomington College of Arts and Sciences Department of Geological Sciences.The aquatic4 plant, Montsechia vidalii, once grew abundantly in freshwater lakes in what are now mountainous regions in Spain. Fossils of the plant were first discovered more than 100 years ago in the limestone5 deposits of the Iberian Range in central Spain and in the Montsec Range of the Pyrenees, near the countrys border with France.Also previously6 proposed as one of the earliest flowers is Archaefructus sinensis, an aquatic plant found in China.A first flower is technically7 a myth, like the first human, said Dilcher, an internationally recognized expert on angiosperm anatomy8 and morphology who has studied the rise and spread of flowering plants for decades. But based on this new analysis, we know now that Montsechia is contemporaneous, if not more ancient, than Archaefructus.He also asserted that the fossils used in the study were poorly understood and even misinterpreted during previous analyses.The reinterpretation9 of these fossils provides a fascinating new perspective on a major mystery in plant biology, said Donald H. Les, a professor of ecology and evolutionary biology at the University of Connecticut, who is the author of a commentary on the discovery in the journal PNAS. Davids work is truly an important contribution to the continued quest to unravel10 the evolutionary and ecological11 events that accompanied the rise of flowering plants to global prominence12.
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1 proceedings n.进程，过程，议程；诉讼；公报 参考例句： He was released on bail pending committal proceedings. 他交保获释正在候审。 to initiate legal proceedings against sb 对某人提起诉讼
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