Hydrangea macrophylla

Japanese: ガクアジサイ

A deciduous shrub of the Saxifragaceae family that grows in coastal areas such as southern Kanto, the Izu Peninsula, the Kii Peninsula, and southern Shikoku. The leaves are thick and obovate. It is the parent species of Hydrangea macrophylla, and is similar in general, but differs in that the five bisexual flowers, both sepals and petals, are gathered in the center of the inflorescence, and the decorative flowers are around the periphery. The flowers bloom in June and July, and the decorative flowers have four sepals and are slightly purple. The bisexual flowers are pale blue-purple. The similar Yamajisai grows in mountainous areas, has thin oval leaves, and usually white flowers. It is distributed from Honshu (mainly on the Pacific coast south of Fukushima Prefecture) to Kyushu. Tamajisai grows inflorescences that are initially wrapped in large bracts to form a globular shape, and grows mainly on the Pacific coast of Fukushima Prefecture to Gifu Prefecture. Both are used as garden trees.
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Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

関東南部，伊豆半島，紀伊半島，四国南部などの沿海地にはえるユキノシタ科の落葉低木。葉は厚く，倒卵形。アジサイの母種で，全体によく似るが，萼片，花弁ともに５枚の両性花が花序の中央に集まり，装飾花が周囲につく点で異なる。花は６〜７月に咲き，装飾花の萼片は４枚で，わずかに紫色をおびる。両性花は淡青紫色。これに似たヤマアジサイは山地にはえ，葉が楕円形で薄く，花は普通白い。本州（福島県以南のおもに太平洋側）〜九州に分布。タマアジサイは花序がはじめ大きな包葉に包まれて球形となるもので，福島県〜岐阜県の主として太平洋側にはえる。いずれも庭木とする。
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