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Eucommia constans
''Eucommia constans'' is an extinct species of flowering plant in the family Eucommiaceae. ''Eucommia'' is a genus of small trees now native to China, with a fossil record that shows a much wider distribution. ''E. constans'' is known from fossil fruits found in Miocene to Pleistocene deposits of east-central Mexico. ''E. constans'' is one of five described fossil species from North America assigned to the modern genus ''Eucommia''. The other species are ''E. eocenica'', ''E. jeffersonensis'', ''E. montana'', and ''E. rowlandii''.
==History and classification==
''Eucommia constans'' was first identified by Susana Magallón-Puebla and Sergio R. S. Cevallos-Ferriz in 1994 from the Miocene to Pleistocene Pié de Vaca Formation which outcrops in the state of Puebla in East-central Mexico. The species is the only record of the genus ''Eucommia'' in Mexico, and is the youngest occurrence of ''Eucommia'' in North America. ''E. constans'' is also the southern most occurrence of ''Eucommia'' in North America,〔 and when first described the species was the southern most species to be described in world.〔 The species was described from a group of over one-hundred and fifty compression fossils studied by Magallón-Puebla and Cevallos-Ferriz who published their findings in an ''International Journal of Plant Sciences'' article. The holotype specimen, IGM-PB 2573-632, is preserved in the paleontological collections housed in the Instituto Geologica which is part of the National Autonomous University of Mexico in Mexico City, Mexico.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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