出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2016/09/30 09:20:34」(JST)
フトモモ科 | ||||||||||||||||||
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学名 | ||||||||||||||||||
Myrtaceae Juss. nom. cons. |
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亜科 | ||||||||||||||||||
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フトモモ科 (Myrtaceae) は双子葉植物に属する科で、すべて木本、3000種以上からなり、130–150属に分けられる。古くはテンニンカ科とも呼んだ。
大部分が世界の熱帯・亜熱帯に分布し、特に東南アジアからオーストラリアにかけてと南米に多い。日本ではアデクが亜熱帯地域(南西諸島や小笠原諸島)に自生し、小笠原諸島には固有のムニンフトモモとヒメフトモモがある。
利用価値のあるものとしては、ユーカリのほか、熱帯果樹のグアバ、レンブ、フトモモ、フェイジョア、ジャボチカバ、ピタンガなど、香辛料のチョウジ(クローブ)、オールスパイスなどのほか、鑑賞用に栽培されるギンバイカ(ミルテ)、ギョリュウバイ、テンニンカやブラシノキを含む。
精油を含み香りのよいものが多い。花は両性で放射相称。花弁は5または4枚、大きく美しいものもあるが、退化してなくなったものもある。長い雄蕊が多数あって、花弁よりむしろ目立つことが多い。葉は常緑で多くは全縁(縁に鋸歯がない)。子房下位で、果実はさく果または液果。
これまで果実の特徴にもとづいて2つの亜科、Leptospermoideae と Myrtoideae に分類されてきた。さく果をつける Leptospermoideae はユーカリ、ブラシノキ、ギョリュウバイなどを含み、特にオーストラリア付近に多く分布する。液果をつける Myrtoideae はギンバイカ(地中海沿岸原産)や、果樹・香辛料として利用される種類を含み、東南アジアと南米に多く分布する。ただし現在この分類は系統学的に再編されつつある。
フェイジョアの花
グアバの実
レンブの実
属名の後に種名を例示する。
ウィキメディア・コモンズには、フトモモ科に関連するカテゴリがあります。 |
ポータル 植物 |
プロジェクト 植物 |
Myrtle family | |
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Myrtus communis foliage and flowers | |
Scientific classification | |
Kingdom: | Plantae |
(unranked): | Angiosperms |
(unranked): | Eudicots |
(unranked): | Rosids |
Order: | Myrtales |
Family: | Myrtaceae Juss.[1] |
Genera | |
About 130; see list |
Myrtaceae is the myrtle family, a family of dicotyledonous plants placed within the order Myrtales. Myrtle, pohutukawa, the bay rum tree, clove, guava, acca (feijoa), allspice, and eucalyptus all are members of this group. All species are woody, with essential oils, and flower parts in multiples of four or five. One notable character of the family is that the phloem is located on both sides of the xylem, not just outside as in most other plants. The leaves are evergreen, alternate to mostly opposite, simple, and usually with an entire (not toothed) margin. The flowers have a base number of five petals, though in several genera the petals are minute or absent. The stamens are usually very conspicuous, brightly coloured and numerous.
Recent estimates suggest the Myrtaceae include approximately 5950 species in ca 132 genera.[2][3] The family has a wide distribution in tropical and warm-temperate regions of the world, and are typically common in many of the world's biodiversity hotspots. Genera with capsular fruits such as Eucalyptus, Corymbia, Angophora, Leptospermum, and Melaleuca are absent from the Americas, apart from Metrosideros in Chile and Argentina. Genera with fleshy fruits have their greatest concentrations in eastern Australia and Malesia (the Australasia ecozone) and the Neotropics. Eucalyptus is a dominant, nearly ubiquitous genus in the more mesic parts of Australia and extends north sporadically to the Philippines. Eucalyptus regnans is the tallest flowering plant in the world. Other important Australian genera are Callistemon (bottlebrushes), Syzygium, and Melaleuca (paperbarks). Species of the genus Osbornia, native to Australasia, are mangroves. Eugenia, Myrcia, and Calyptranthes are among the larger genera in the neotropics.
Historically, the Myrtaceae were divided into two subfamilies. Subfamily Myrtoideae (about 75 genera) was recognized as having fleshy fruits and opposite, entire leaves. Most genera in this subfamily have one of three easily recognized types of embryos. The genera of Myrtoideae can be very difficult to distinguish in the absence of mature fruits. Myrtoideae are found worldwide in subtropical and tropical regions, with centers of diversity in the Neotropics, northeastern Australia, and Malesia. In contrast, subfamily Leptospermoideae (about 80 genera) was recognized as having dry, dehiscent fruits (capsules) and leaves arranged spirally or alternate. The Leptospermoideae are found mostly in Australasia, with a centre of diversity in Australia. Many genera in Western Australia have greatly reduced leaves and flowers typical of more xeric habitats.
The division of Myrtaceae into Leptospermoideae and Myrtoideae was challenged by a number of authors, including Johnson and Briggs (1984), who identified 14 tribes or clades within Myrtaceae, and found Myrtoideae to be polyphyletic. Molecular studies by several groups of authors, as of 2008, have confirmed the baccate (fleshy) fruits evolved twice from capsular fruits, and as such, the two-subfamily classification does not accurately portray the phylogenetic (= evolutionary) history of the family. Thus, many workers are now using a recent analysis by Wilson et al. (2001) as a starting point to test further analyses of the family.
The genera Heteropyxis and Psiloxylon have been separated as separate families by many authors in the past as Heteropyxidaceae and Psiloxylaceae.[4][5] However, Wilson et al.[6] included them in Myrtaceae. These two genera are presently believed to be the earliest arising and surviving lineages of Myrtaceae.
The most recent classification recognizes 17 tribes and two subfamilies, Myrtoideae and Psiloxyloideae, based on a phylogenetic analysis of plastid DNA.[7]
Many new species are being described annually from throughout the range of Myrtaceae. Likewise, new genera are being described nearly yearly.
Myrtaceae is foraged by many stingless bees, especially by the species Melipona bicolor which gather pollen from this plant family.[8]
Wikimedia Commons has media related to Myrtaceae. |
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