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''Retrophyllum'' is a genus of coniferous gymnosperms in the family Podocarpaceae. 〔 Christopher N. Page. 1990. "Podocarpaceae" pages 332-346. In: Klaus Kubitzki (general editor); Karl U. Kramer and Peter S. Green (volume editors) ''The Families and Genera of Vascular Plants'' volume I. Springer-Verlag: Berlin;Heidelberg, Germany. ISBN 978-0-387-51794-0 〕 It has a disjunct distribution in the Southern Hemisphere, found in Papuasia and also in South America.〔(Kew World Checklist of Selected Plant Families )〕〔 James E. Eckenwalder. 2009. ''Conifers of the World''. Timber Press: Portland, OR, USA. ISBN 978-0-88192-974-4. 〕 Fossil Record ''Retrophyllum'' shoots have a distinctive morphology in which the leaves are in opposite pairs, and twisted in such a way that the abaxial surface of one leaf is up, and in the other it is down. This feature, added to a distinctive epidermal morphology means that well-preserved specimens can be easily identified in the fossil record. The fossil record shows that ''Retophyllum'' was present in the Cenozoic of Australia (Hill and Pole 1992) and New Zealand (Pole 1992, 1997). It is now extinct in both places. Taxonomy In a 2009 book on conifers, ''Retrophyllum piresii'' was treated as conspecific with ''Retrophyllum rospigliosii''. The author stated "One specimen from low elevations in Brazil was separated as a distinct species, but it falls well within the range of variation of the species as a whole and is geographically close to some locations in Peru." ;species〔 # ''Retrophyllum comptonii'' (J.Buchholz) C.N.Page - New Caledonia # ''Retrophyllum minus'' (Carrière) C.N.Page - Plaine des Lacs in New Caledonia # ''Retrophyllum piresii'' (Silba) C.N.Page - Serra dos Pacaás Novos in Rondônia State in W Brazil # ''Retrophyllum rospigliosii'' (Pilg.) C.N.Page - Colombia, Venezuela, Peru, Ecuador, Brazil # ''Retrophyllum vitiense'' (Seem.) C.N.Page - Maluku, New Guinea, Fiji, Bismarck Archipelago, Santa Cruz Islands == 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「Retrophyllum」の詳細全文を読む スポンサード リンク
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