Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy;Vol.XX, Nos.2-3


Engelhardia Fruits from the Tertialy of Japan

Tanai, Toshimasa;Uemura, Kazuhiko

Permalink :


The winged fruits of Engelhardia (Juglandaceae) are described on the basis of the new materials from Kitami in Hokkaido and Heki in Yamaguchi Prefecture, in addition to the re-investigation of the type specimens of E. koreanica Oishi and E. poronaica Endo. All the winged fruits known from East Asia are identical with E. koreanica in all characters. E. koreanica is characterized by trilobed fruits which have marked stalk, pinnate venation, straight primaries reaching the apices and branched fine veinlets. E. koreanica shows a close relationship to the extant E. roxburghiana Wall. of the section Psilocarpeae in the above-noted characters. Reviewing Engelhardia bearing floras in Japan, North Korea, southern Primorye and Sikhote-Alin, they are concluded to be of Late Oligocene age by floristic composition, as well as by K-Ar datings and other biostratigraphic evidences.