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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Trochodendron nastae ： ウィキペディア英語版 Trochodendron nastae ''Trochodendron nastae'' is an extinct species of flowering plant in the family Trochodendraceae known from fossil leaves found in the early Eocene Ypresian stage Klondike Mountain Formation deposits of Northern Washington State. ''T. nastae'' is one of the oldest members of the genus ''Trochodendron'', which includes the living species ''T. aralioides'', native to Japan, southern Korea and Taiwan〔 and the coeval extinct species ''T. drachuckii'' from the McAbee Fossil Beds near Cache Creek, British Columbia. Description of the new species by Dr. Kathleen Pigg, Wesley Wehr, and Stephanie Ickert-Bond was based on the study of 11 complete and 55 partial compression fossil specimens with the holotype specimen, number "SR 98-02-01", being housed in the Stonerose Interpretive Center, Republic, Washington.〔 They published their 2001 type description of the species in the ''International Journal of Plant Sciences'' volume number 162. and named the species ''nastae'' in honor of Charlotte G. Nast for her work on extinct and living members of the Trochodendrales.〔 ''T. nastae'' has been placed in the genus ''Trochodendron'' based on the overall shape of the leaves, the secondary vein structure, which forms weak chevrons bracing primary veins, and the tertiary veins forming four to five sided cells.〔 However the primary veins are palmate in structure for ''T.nastae'' rather than being pinnate as in ''T. aralioides''.〔 ''Trochodendron'' shares with ''Tetracentron'' the very unusual feature in angiosperms, of lacking vessel elements in its wood. This has long been considered a very primitive character, resulting in the classification of these two genera in a basal position in the angiosperms; however, genetic research by the Angiosperm Phylogeny Group has shown it to be in a less basal position (early in the eudicots), suggesting that the absence of vessel elements is a secondarily evolved character, not a primitive one. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Trochodendron nastae」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.