Aster-like
Aster-like | ||||||||||||
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Fever clover ( Menyanthes trifoliata ) |
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Systematics | ||||||||||||
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Scientific name | ||||||||||||
Asterales | ||||||||||||
Lindl. |
The aster-like (Asterales) are an order of the flowering plants (Magnoliopsida). It is one of the most species-rich orders of the flowering plants. Fossil finds have been known since the Oligocene , about 29 million years ago; so it is still a relatively new order.
description
There are far more herbaceous taxa than woody ones. There are never any stipules . The leaves are seldom simple, often serrated or notched, sometimes divided.
The flowers are usually five-fold. The petals are always fused ( sympetalie ). The fruits are capsule fruits or achenes .
Within this order, a tendency towards the formation of pseudanthia (false flowers), from radial symmetrical flowers to zygomorphic (mirror symmetrical) flowers, to adhesions in the stamen area , and to a reduction of the carpels from five to two can be observed.
Systematics
The aster-like are placed within the group of asterids named after them in the Euasterids II . The following families are included in the order :
- Alseuosmiaceae
- Argophyllaceae
- Daisy family (Asteraceae)
- Calyceraceae
- Bellflower Family (Campanulaceae) (including Lobeliaceae )
- Goodeniaceae (Goodeniaceae)
- Fever clover family (Menyanthaceae)
- Pentaphragmataceae
- Phellinaceae
- Rousseaceae
- Stylidiaceae (including Donatiaceae)
A simplified cladogram based on a work by Tachtadschjan (1997) describes the relationships within the Asterales as follows:
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swell
- The order in APWebsite (Engl.)
- Information on the regulations from the University of Hamburg. (German)
Individual evidence
- ↑ Angiosperm Phylogeny Group : An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III. In: Botanical Journal of the Linnean Society. Volume 161, No. 2, 2009, pp. 105-121, DOI: 10.1111 / j.1095-8339.2009.00996.x .
- ↑ : The Asterales order on the AP website: [1]