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''Zelkova'' is a genus of six species of deciduous trees in the elm family Ulmaceae, native to southern Europe, and southwest and eastern Asia. They vary in size from shrubs (''Z. sicula'') to large trees up to tall (''Z. carpinifolia''). The leaves are alternate, with serrated margins, and (unlike the related elms) a symmetrical base to the leaf blade. The fruit is a dry, nut-like drupe, produced singly in the leaf axils.〔Andrews, S. (1994). Tree of the year: Zelkova. ''Int. Dendrol. Soc. Yearbook'' 1993: 11-30.〕〔de Spoelberch, P. (1994). Zelkova: More questions than answers. ''Int. Dendrol. Soc. Yearbook'' 1993: 30–33.〕〔Hunt, D. (1994). Beware of the Zelkova. ''Int. Dendrol. Soc. Yearbook'' 1993: 33–41.〕〔Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins. ISBN 0-00-220013-9.〕 ==Species and distribution== *''Zelkova abelicea''—Cretan Zelkova (Crete in Greece) *''Zelkova carpinifolia''—Caucasian Zelkova (Turkey, Georgia, Armenia, Azerbaijan, Iran) *''Zelkova serrata''—Keyaki or Japanese Zelkova (Japan, Korea, Kuril Islands in Russia, Taiwan, China) * *''Zelkova serrata'' var. ''serrata'' * *''Zelkova serrata'' var. ''tarokoensis'' *''Zelkova sicula''—Sicilian Zelkova (Sicily in Italy) *''Zelkova sinica''—Chinese Zelkova (China) *''Zelkova schneideriana''—Schneider's Zelkova (China) ;Hybrids *''Zelkova × verschaffeltii''—Cut-leaf Zelkova (''Z. carpinifolia'' × ''Z. serrata'') 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「Zelkova」の詳細全文を読む スポンサード リンク
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