Aquifoliales
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What is the Aquifoliales order?
The Aquifoliales are an order of flowering plants consisting of more than 536 species in five families, most notably the Aquifoliaceae (holly family). Aquifoliales is within the core asterid clade, a sympetalous lineage of flowering plants, in the euasterid II group of the Angiosperm Phylogeny Group III (APG III) botanical classification system. Aquifoliaceae, from the order Sapindales, are shrubs and trees with simple, evergreen leaves, small dioecious flowers, and berrylike drupes. The APG system focuses on families and their relationship to plant diversity.
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Which types of plants belong to the Aquifoliales order?
The Aquifoliales order primarily consists of the holly family (Aquifoliaceae), containing over 536 species. This order belongs to the core asterid clade, also known as the sympetalous lineage, within the euasterid II group of the Angiosperm Phylogeny Group III (APG III) botanical classification system.
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What are some common features of plants in the Aquifoliales order?
The Aquifoliales order, primarily represented by the Aquifoliaceae family, includes more than 536 species, mainly holly. These are mainly shrubs and trees that have alternate, simple, often evergreen leaves. Their flowers are small and dioecious, typically growing in axillary clusters, and they produce berry-like drupes. A typical leaf consists of a broad, expanded blade and a petiole that attaches it to the plant stem.
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Where are Aquifoliales plants commonly found in the world?
The Aquifoliales order comprises more than 536 species in five families, with Aquifoliaceae being the main one. Aquifoliaceae, also known as the holly family, includes widely distributed shrubs and trees that feature simple, alternate, and often evergreen leaves.
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Why is holly (Ilex) an important member of the Aquifoliales order?
The holly family (Aquifoliaceae) is a significant part of the Aquifoliales order, mainly due to the prominence of the Ilex genus, also known as holly, which has over 400 species. Ilex species are distributed nearly worldwide and are known for their ornamental value, with distinctive foliage and red or black fruits that persist into winter, making them popular as Christmas decorations. Additionally, the dried leaves of I. paraguariensis are used in South America to prepare yerba maté, a caffeine-rich beverage.
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How do scientists classify and study the different families within Aquifoliales?
Scientists classify the Aquifoliales order of flowering plants, containing more than 536 species in five families, mainly Aquifoliaceae.
Two small families in the order are closely related to Aquifoliaceae:
* Helwingiaceae, with the genus Helwingia, consists of three species of shrubs from eastern Asia.
* Phyllonomaceae has a single woody genus, Phyllonoma, with four species that range from Mexico to Bolivia.Two closely related families are included within Aquifoliales:
* Stemonuraceae comprises 12 genera and 95 species found in tropical regions from Southeast Asia to Australia.
* Cardiopteridaceae includes five genera and about 45 species.2 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Aquifoliales, holly order of flowering plants, containing more than 536 species in five families, mainly Aquifoliaceae. Aquifoliales belongs to the core asterid clade (organisms with a single common ancestor), or sympetalous lineage of flowering plants, in the euasterid II group of the Angiosperm Phylogeny Group III (APG III) botanical classification system (see angiosperm).
Aquifoliaceae
Aquifoliaceae, the holly family, contains the holly genus Ilex, with more than 400 species. Ilex is nearly worldwide in distribution, but it is best represented in mountainous areas of the tropics, especially in Asia, Central America, and South America. However, several well-known hollies range northward into southern Europe and the eastern United States. Ilex aquifolium (European holly) grows to 15 metres (50 feet) and furnishes valuable wood for veneers. It is used for decoration, and hundreds of horticultural varieties are available for ornamental plantings. I. opaca (American holly) is widely distributed in the warmer areas of the eastern United States, and it is grown in commercial orchards for its foliage and colourful berrylike fruits. Wood of this species is valuable in cabinetmaking and interior finishing. I. opaca is also an accent tree with more than 1,000 horticultural varieties and is used for street plantings and wind barriers and is even grown as bonsai. The dried leaves of I. paraguariensis are widely used in parts of South America to prepare a caffeine-rich beverage known as yerba maté.
Aquifoliaceae are shrubs or trees with alternate, sometimes toothed leaves that may have small glands on the lower surface of the blade. Some species are deciduous, but most are evergreen. The flowers are usually unisexual and occur on separate male and female plants. Thus, male and female hollies are planted close together in orchards to facilitate pollination. The sepals, petals, stamens, and carpels each number four to six parts or, rarely, more. The petals are generally slightly joined at the base, where the stamens are usually attached in a position alternate with the petals. The female flowers have a distinctive large stigma that sits directly atop the ovary (there is typically no style), and each chamber of the ovary generally has a single ovule on an axile placentation. Although hollies are usually pollinated by bees, their flowers lack nectary disks; sometimes the petals themselves produce nectar through swellings on their upper surface. The flowers are usually clustered into a cyme or umbel but may also be single in the leaf axils. The fruits of hollies are fleshy and are often brightly coloured when ripe. Technically, they are not berries but drupes, which have a stony pit embedded in the pulpy outer layer. When the fruit is dispersed, the embryo is often minute and barely developed; for this reason it may take up to a few years for germination to occur.
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Other families
Two small families in the order are closely related to Aquifoliaceae. Helwingiaceae, with the genus Helwingia, consists of three species of shrubs from eastern Asia. Phyllonomaceae has a single woody genus, Phyllonoma, with four species that range from Mexico to Bolivia. Both families have flowers in clusters that emerge directly from the leaf surface rather than from the stems. The flowers also feature inferior ovaries, well-developed nectaries, anthers free from the petals, and recurved stigmas. Helwingia has unisexual flowers and lacks sepals, whereas Phyllonoma has bisexual flowers with both petals and sepals.
Two closely related families are included within Aquifoliales. Stemonuraceae comprises 12 genera and 95 species found in tropical regions from Southeast Asia to Australia. The two largest genera are Gomphandra (55 species) and Stemonurus (15 species). The family is characterized by woody plants that have entire leaves with no stipules, small flowers in cymes, stout, hairy stamen filaments, and a broad, sessile stigma. Cardiopteridaceae includes five genera and about 45 species. The largest genus is Citronella, which has 21 species and was formerly included in Icacinaceae. This genus is unrelated to the citronella used as an ingredient in some insect repellents.