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The North American flora is represented by the species Liriodendron tulipifera, Juglans nigra, Catalpa bignonioides, Juniperus virginiana and Yucca filamentosa; that of Europe and Siberia by Aesculus hippocastanum, Cercis siliquastrum, Quercus robur and Larix sibirica and that of East Asia by Sophora japonica and Metasequoia glyptostroboides.