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''Celtis'', commonly known as hackberries or nettle trees, is a genus of about 60–70 species of deciduous trees widespread in warm temperate regions of the Northern Hemisphere, in southern Europe, southern and eastern Asia, and southern and central North America, south to central Africa, and northern and central South America. The genus is present in the fossil record at least since the Miocene of Europe.〔Keeler (1900): pp.249–252.〕〔MacPhail et. al. (1994): pp. 231.〕 Previously included either in the elm family (Ulmaceae) or a separate family, Celtidaceae, the APG III system places ''Celtis'' in an expanded hemp family (Cannabaceae).〔(【引用サイトリンク】 Celtis L. )〕 The generic name originated in Latin and was applied by Pliny the Elder (23–79) to the unrelated ''Ziziphus lotus''. ==Description== ''Celtis'' species are generally medium-sized trees, reaching tall, rarely up to tall. The leaves are alternate, simple, long, ovate-acuminate, and evenly serrated margins. Small monoecious flowers appear in early spring while the leaves are still developing. Male flowers are longer and fuzzy. Female flowers are greenish and more rounded. The fruit is a small drupe in diameter, edible in many species, with a dryish but sweet, sugary consistency, reminiscent of a date 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「Celtis」の詳細全文を読む スポンサード リンク
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