Blue water - Blue water

Japanese: アオミズ - あおみず

A soft annual plant of the Urticaceae family that grows in damp places in low mountain areas (illustration). Along with the closely related Mizu, P. hamaoi Makino, it is widely distributed throughout Japan and is a very common plant. The stem is 30-50 cm tall, hairless and soft. The leaves are opposite, ovate-elliptical, and 3-10 cm long. Flowers appear in a pair of inflorescences that emerge from the leaf axils in July and August, with the upper inflorescence bearing female flowers and the lower inflorescence bearing male flowers. Fruits are produced in September and October. The number of tepals is an important characteristic in the classification of Mizu, and Aomizu and Mizu are unique among the genus in that male flowers have two tepals (there are usually four in Mizu).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

低山地の湿った場所に生えるやわらかいイラクサ科の一年草（イラスト）。近縁のミズP.hamaoi Makinoとともに日本全土に広く分布し，ごく普通の植物である。茎は高さ30～50cm，無毛でやわらかい。葉は対生し，卵状楕円形で長さ3～10cm。花は7～8月に葉腋（ようえき）からでる1対の花序につき，上方の花序は雌花を，下方の花序は雄花をつける。果実は9～10月。花被片の数はミズ属の分類上重要な特徴で，アオミズとミズは雄花の花被片が2枚である点でミズ属の中でも特殊な存在である(ミズ属では通常4枚)。

出典　株式会社平凡社世界大百科事典第２版について　情報

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