The morphological investigation of sweet osmanthus plants (Osmanthus fragtans var. aurantiacus) which flowers twice in a season at Kamigamo and Shimogamo area in Kyoto.

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  • 京都市上賀茂および下鴨地域でのキンモクセイ（Ｏｓｍａｎｔｈｕｓ　ｆｒａｇｒａｎｓ　ｖａｒ．ａｕｒａｎｔｉａｃｕｓ）二度咲き現象の実態調査
  • 京都市上賀茂および下鴨地域でのキンモクセイ(Osmanthus fragtans var. aurantiacus)二度咲き現象の実態調査
  • キョウトシ カミガモ オヨビ シモガモ チイキ デノ キンモクセイ Osmanthus fragtans var aurantiacus ニドザキ ゲンショウ ノ ジッタイ チョウサ

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Abstract

There is uncertain information that sweet osmanthus (Osmanthus fragtans var. aurantiacus) trees may show twice flowering peaks. To clarify that, we measured the number of floral buds, flowering floral buds and flowering florets of sweet osmanthus trees used as garden or landscape trees in the north residential area of Kyoto City. Results showed that most of trees investigated reached a peak of flowering twice October 11th and 23rd, 2007. It is considered that many people do not know the twice flowering of the sweet osmanthus because the number of flowering florets and amount of fragrance on trees in the second flowering peak were less than those in the first. On the osmanthus trees, flowering florets were observed on both the current shoot and the 2nd-year shoot and these florets derived from the axillary buds and also the adventitious buds. In addition, floral buds on the 2nd-year shoot contributed to the second flowering peak more than those of the current shoot, and also of those adventitious flower buds do so than axillary buds. The adventitious buds seem to be deeply-involved in the second flowering peak of sweet osmanthus tree as the current shoot tends to make adventitious buds more easily than the 2nd-year shoot.

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