Screw tree-like
| Screw tree-like | ||||||||||||
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Screw tree ( Pandanus tectorius ), |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Pandanales | ||||||||||||
| Lindl. |
The screw tree-like (Pandanales) are an order of the monocotyledons .
features
The representatives of this order are linked to one another by relatively few common derived characteristics ; the relationship of the five families was only found out through molecular genetic studies. This includes an overgrown androeceum and possibly tenuinucellate ovules . Starchy endosperm is the rule. In gene ATPA is a 6 bp large deletion .
The Cyclanthaceae and Stemonaceae have the four-fold flowers , which are rare in the monocot in common. Cyclanthaceae, Pandanaceae and Triuridaceae have flowers that also have the characteristics of inflorescences .
Systematics and distribution
The Pandanales are the sister group of the Dioscoreales .
According to APG III, five families belong to this order :
- Disc flower family (Cyclanthaceae)
- Screw tree plants (Pandanaceae)
- Stemonaceae
- Triuridaceae
- Velloziaceae
Individual evidence
- Mark Chase: Monocot relationships: An overview . American Journal of Botany, Volume 91, 2004, pp. 1645-1655.
- PF Stevens: Angiosperm Phylogeny Website. Version 9, June 2008 [and more or less continuously updated since]. 2001ff. (Pandanales section) , accessed August 14, 2008.
- ↑ 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, 161: 2, 2009, pp. 105-121
Web links
further reading
- Carol A. Furness, Paula J. Rudall: Comparative Structure and Development of Pollen and Tapetum in Pandanales . International Journal of Plant Sciences, 2006, Volume 167, pp. 331-348. doi : 10.1086 / 499503