Comptonia (English spelling)

Japanese: コンプトニア（英語表記）Comptonia

A genus of dicotyledonous plants in the Myricaceae family. There is only one extant species in the genus Comptonia, which is a deciduous small shrub found in eastern North America. It was widely distributed in the Northern Hemisphere in the mid-Tertiary period, surviving until the late Miocene in Europe and the early Pliocene in Japan. The leaves are often lanceolate and divided into small lobes resembling the pinnae of a fern. Each lobe has two to four lateral veins extending directly from the mid-vein. In Japan, it is abundant in the Daijima-type flora of the mid-Miocene. C. yanagisawae with 16 to 20 lobes, known as the Comptonia - Liquidambar flora, has been reported from the Oligocene of the Shirasui Group of the Joban Coalfield, C. naumannii with 11 to 16 lobes from the Miocene of the Utsuto Formation in Akita Prefecture, and C. kidoi with 7 to 11 lobes from the Early Pliocene of the Oriwatari Formation in Yamagata Prefecture.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

双子葉類ヤマモモ科Myricaceaeの1属。コンプトニア属の現生種は1種だけで，北アメリカ東部に分布し，落葉性の小灌木である。第三紀中期には北半球に広く分布し，ヨーロッパでは中新世後期まで，日本では鮮新世初期まで生き残った。葉は披針形のものが多く，小裂片に分かれシダの羽片に似る。また，各裂片には2～4本の側脈が主脈から直接に出る。日本では中新世中期の台島型植物群に多産。コンプトニア‐リクイダンバーComptonia‐Liquidambar植物群として知られている裂片が16～20のC.yanagisawaeが常磐炭田白水層群の漸新世から，11～16裂片のC.naumanniiが秋田県打当（うつとう）層の中新世から，7～11裂片のC.kidoiが山形県折渡（おりわたり）層の鮮新世前期から報告されている。

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