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The term grex (pl. greges), derived from the Latin noun ''grex, gregis'' meaning 'flock', has been coined to expand botanical nomenclature to describe horticultural hybrids of orchids, based solely on their specified parentage.〔Brickell, C.D.; Braun, B.R.; Hetterscheid, W.L.A.; Leslie, A.C.; McNeill, J.; Trehane, P.; Vrugtman, F.; Wiersema, J.H. 2004. ''International Code of Nomenclature for Cultivated Plants (I.C.N.C.P. or Cultivated Plant Code) incorporating the Rules and Recommendations for naming plants in cultivation, Seventh Edition, Adopted by the International Union of Biological Sciences Commission for the Nomenclature of Cultivated Plants''. International Society for Horticultural Science and International Association for Plant Taxonomy. Article 3.3〕 A named grex may be specified as a hybrid between: * two species * two greges. ==Botanical nomenclature of hybrids== Interspecific hybrids occur in nature, and are treated under the International Code of Nomenclature for algae, fungi, and plants as nothospecies, ('notho' indicating hybrid). They can be given Linnean binomials with a multiplication sign "×" before the species epithet,〔 Article H1〕 for example ''Crataegus'' × ''media''. An offspring of the nothospecies, either with the nothospecies or any of the parental species as the other parent, has the same nothospecific name. That is, the nothospecific binomial is an alias for a list of the ancestral species, whether the ancestry is precisely known or not. For example, a hybrid between ''Cattleya warscewiczii'' Rchb.f. 1854 and ''Cattleya aurea'' Linden 1883 can be called ''Cattleya'' ×''hardyana'' Sander 1883 or simply ''Cattleya hardyana''. An offspring of a ''Cattleya'' × ''hardyana'' pollenized by another ''Cattleya'' × ''hardyana'' would also be called ''Cattleya'' × ''hardyana''. ''Cattleya'' × ''hardyana'' would also be the name of an offspring of a ''Cattleya'' × ''hardyana'' pollenized by either a ''Cattleya warscewiczii'' or a ''Cattleya aurea'', or an offspring of either a ''Cattleya warscewiczii'' or a ''Cattleya aurea'' pollenized by a ''Cattleya'' × ''hardyana''. An earlier term was nothomorph for subordinate taxa to nothospecies. Since the 1982 meeting of the International Botanical Congress, such subordinate taxa are considered varieties. 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「Grex (horticulture)」の詳細全文を読む スポンサード リンク
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