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Cannabaceae is a small family of flowering plants. As now circumscribed, the family includes about 170 species grouped in about 11 genera, including ''Cannabis'' (hemp, marijuana), ''Humulus'' (hops) and ''Celtis'' (hackberries). ''Celtis'' is by far the largest genus, containing about 100 species.〔Stevens, P.F. (2001 onwards) ("Cannabaceae" ), ''Angiosperm Phylogeny Website'', retrieved 2014-02-25〕 Other than a shared evolutionary origin (see Phylogeny below), members of the family have few common characteristics; some are trees (e.g. ''Celtis''), others are herbaceous plants (e.g. ''Cannabis''). ==Description== Members of this family can be trees (e.g. ''Celtis''), erect herbs (e.g. ''Cannabis''), or twining herbs (e.g. ''Humulus'').〔 Leaves are often more or less palmately lobed or palmately compound and always bear stipules. Cystoliths are always present and some members of this family possess laticifers. Cannabaceae are often dioecious (distinct male and female plants). The flowers are actinomorphic (radially symmetrical) and not showy, as these plants are pollinated by the wind. As an adaptation to this kind of pollination, the calyx is short and there is no corolla. Flowers are grouped to form cymes. In the dioecious plants the masculine inflorescences are long and look like panicles, while the feminine are shorter and bear less flowers. The pistil is made of two connate carpels, the usually superior ovary is unilocular; there is no fixed number of stamens. The fruit can be an achene or a drupe. 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「Cannabaceae」の詳細全文を読む スポンサード リンク
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