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In naming cultivated plants, a Group (with a capital G), previously called a cultivar-group, is a formal classification category in the ''International Code of Nomenclature for Cultivated Plants'' (ICNCP): :''ICNCP'' Art. 3.1: "a formal category for assembling cultivars, individual plants or assemblages of plants on the basis of defined similarity." Every word in a Group epithet (name) is capitalised, except where not permitted by English-language custom, e.g. conjunctions, prepositions (that do not begin the epithet), and words following a hyphen (that are not proper names). (Art. 21.3) The term "Group" (with a capital G) was introduced in the 2004 ICNCP, replacing the "cultivar-group" of the 1995 ICNCP. A Group is united by some common trait; for example there may be a Group of yellow-flowering cultivars, a Group of cultivars with variegated leaves, a Group of cultivars resistant to a particular disease, etc. A cultivar may belong to more than one Group (for example, it may be yellow-flowering, with variegated leaves and resistant to the disease at one and the same time, or another time). :''ICNCP'' Art 9, Ex 10: "''Solanum tuberosum'' 'Desiree' may be designated part of a Maincrop Group and a Redskin Group since both such designations may be practical to buyers of potatoes ..." (in original, as required by the ''ICNCP'' ) Another reason for designating a Group is when a well-known plant loses its taxonomic status (e.g. it ceases to be a "good" species or subspecies and becomes a synonym). Its botanical epithet may be retained in a "Group epithet". For example, ''Tetradium hupehense'' is sometimes regarded as being part of ''Tetradium daniellii'', and the plants in question may then be referred to as ''Tetradium daniellii'' Hupehense Group. == 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「cultivar group」の詳細全文を読む スポンサード リンク
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