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Alnus maritima : ウィキペディア英語版 | Alnus maritima
''Alnus maritima'' (also called Seaside Alder) is a species of plant in the Betulaceae family. ''Alnus maritima'' is endemic to the United States, and is found naturally in three disjunct populations in Oklahoma, Georgia, and in Maryland and Delaware on the Delmarva Peninsula. In 2002, the three populations were recognized as subspecies and given the names ''Alnus maritima'' subsp. ''oklahomensis'', ''Alnus maritima'' subsp. ''georgiensis'', and ''Alnus maritima'' subsp. ''maritima'', respectively.〔Schrader, J.A. and W.R. Graves. 2002. Infraspecific systematics of ''Alnus maritima'' (Betulaceae) from three widely disjunct provenances. Castanea 67: 380–401.〕 While some believe that subspecies ''maritima'' is the oldest of the three subspecies and that the other two disjunct populations resulted from some form of long distance dispersal, evidence from morphometric and phylogeographic studies indicates that the Oklahoma population (subsp. ''oklahomensis'') is in fact the most ancestral and that the species probably had a wide, continuous distribution across the United States in the past.〔〔Schrader, J.A. and W.R. Graves. 2004. Systematics of Alnus maritima (seaside alder) resolved by ISSR polymorphisms and morphological characters. J. Amer. Soc. Hort. Sci. 129: 231–236.〕 ''Alnus maritima'' is considered a large shrub or small tree and is the only autumn-blooming member of its genus native to North America. All other North American alders bloom in the spring. The autumn-blooming phenology is a characteristic that ''Alnus maritima'' shares with two old-world ''Alnus'' species, ''Alnus nitida'' and ''Alnus nepalensis'', which are endemic to southeast Asia. This profound similarity in their timing of anthesis has led to their classification as the only three members in the subgenus ''Clethropsis''.〔 == Sources ==
* World Conservation Monitoring Centre 1998. (''Alnus maritima'' ). (2006 IUCN Red List of Threatened Species. ) Downloaded on 20 August 2007.
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