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''Aster'' is a genus of flowering plants in the family Asteraceae. Its circumscription has been narrowed, and it now encompasses around 180 species, all but one of which are restricted to Eurasia; many species formerly in ''Aster'' are now in other genera of the tribe Astereae. ==Circumscription== The genus ''Aster'' once contained nearly 600 species in Eurasia and North America, but after morphologic and molecular research on the genus during the 1990s, it was decided that the North American species are better treated in a series of other related genera. After this split there are roughly 180 species within the genus, all but one being confined to Eurasia.〔 in Flora of North America.〕 The name ''Aster'' comes from the Ancient Greek word ('), meaning "star", referring to the shape of the flower head. Many species and a variety of hybrids and varieties are popular as garden plants because of their attractive and colourful flowers. ''Aster'' species are used as food plants by the larvae of a number of Lepidoptera species—see list of Lepidoptera that feed on ''Aster''. Asters can grow in all hardiness zones. The genus Aster is now generally restricted to the Old World species, with ''Aster amellus'' being the type species of the genus, as well as of the family Asteraceae. The New World species have now been reclassified in the genera ''Almutaster'', ''Canadanthus'', ''Doellingeria'', ''Eucephalus'', ''Eurybia'', ''Ionactis'', ''Oligoneuron'', ''Oreostemma'', ''Sericocarpus'' and ''Symphyotrichum'', though all are treated within the tribe Astereae. Regardless of the taxonomic change, all are still widely referred to as "asters" (popularly "Michaelmas daisies" because of their typical blooming period) in the horticultural trades. See the List of ''Aster'' synonyms for more information. Some common North American species that have now been moved are: * ''Aster breweri'' (now ''Eucephalus breweri''), Brewer's aster * ''Aster cordifolius'' (now ''Symphyotrichum cordifolium''), blue wood aster * ''Aster dumosus'' (now ''Symphyotrichum dumosum''), New York aster * ''Aster divaricatus'' (now ''Eurybia divaricata''), white wood aster * ''Aster ericoides'' (now ''Symphyotrichum ericoides''), heath aster * ''Aster laevis'' (now ''Symphyotrichum laeve''), smooth aster * ''Aster lateriflorus'' (now ''Symphyotrichum lateriflorum''), "Lady in Black", calico aster * ''Aster novae-angliae'' (now ''Symphyotrichum novae-angliae''), New England aster * ''Aster novi-belgii'' (now ''Symphyotrichum novi-belgii''), New York aster * ''Aster peirsonii'' (now ''Oreostemma peirsonii''), Peirson's aster * ''Aster protoflorian'' (now ''Symphyotrichum pilosum)'', frost aster * ''Aster scopulorum'' (now ''Ionactis alpina''), lava aster * ''Aster sibiricus'' (now ''Eurybia sibirica''), Siberian aster The "China aster" is in the related genus ''Callistephus''. 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「Aster (genus)」の詳細全文を読む スポンサード リンク
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