An evergreen or deciduous dicotyledonous tree of the genus Ochna in the family Ochnaceae (illustration). Approximately 30 species are known to grow as shrubs or trees in the tropical regions of Asia, Africa, and South America. The leaves are glossy, leathery, alternate, and have finely toothed edges. There are no stipules. Flowers are borne one to many in terminal inflorescences on the branches, and are persistent with five sepals. There are five to ten petals and many stamens. The ovary is deeply divided into 3 to 10 lobes, each of which produces a single seed, resulting in a strange-looking fruit with several drupes attached to a developed stipe. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
常緑あるいは落葉の双子葉植物オクナ科オクナ属の樹木(イラスト)。アジア,アフリカ,南アメリカの熱帯域に低木あるいは高木になる約30種が知られている。 葉は光沢があり革質で,互生し,葉縁には細かな鋸歯がある。托葉はない。花は枝に頂生する花序に1個から多数がつき,萼片は5枚で宿存する。花弁は5ないし10枚。おしべは多数。子房は深く3~10裂していて,それぞれに1個の種子を形成するため,実は発達した果托に数個の核果をつける奇妙な形をとる。
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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