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The discovery of the oldest known angiosperm inflorescences in the world from Lower Cretaceous of Jixi, Heilongjiang


The discovery of the oldest known angiosperm inflorescences in the world from Lower Cretaceous of Jixi, Heilongjiang



Acta Palaeontologica Sinica 36(2): 135-142



ISSN/ISBN: 0001-6616

A new discovery of the oldest known angiosperm (dicotyledonous) inflorescences in the world, Jingxueina heilongjiangensis gen. et sp. nov. from Lower Cretaceous Chengzihe Formation of Jixi, eastern Heilongjiang Province, China, is reported for the first time. The inflorescence is elongate, spike-like, small in size, about 14 mm long by about 4 mm wide, consisting of numerous small florets borne helically upon a stout axis. The pedicle below the attachment of the florets is slightly arching, about 20 mm long by 1.5 mm wide and appears to be borne on the axis of a leaf. Florets are crowded, rounded in form and small in size, about 1.1-1.5 mm in diameter. Structure of individual florets has not been understood but in situ pollen were found. Pollen are nearly circular, 15.20 mm in diameter, seemingly inaperturate, with exine reticulate and tectate-columellate.

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Accession: 020321635

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