Drosera burmanni
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Drosera burmanni , Phukradung, Thailand |
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| Drosera burmanni | ||||||||||||
| Vahl |
Drosera burmanni is a carnivorous plant belonging to the genus sundew ( Drosera ). The plant is widespread in the Australasian region. In China it is used medicinally.
description
In Drosera burmannii is a small rosette-forming sundew with flat, earthy rosette of about 1.2 to 2 cm in diameter measures, depending on the location it is one to two year. The root system consists of a few fibrous roots. The number of chromosomes is 2n = 20.
The almost sessile to short-stalked, tentacle-occupied, spatulate catch leaves are 5 to 7 mm wide and 6 to 10 mm long, yellowish green or red to reddish purple. They have a special feature: the unusually long and very fast moving edge tentacles that can move within a few seconds. They enclose the prey like a cage within a very short time and press it against the leaf, which increases the contact with the tentacles on the leaf surface.
The plants bloom all year round. The flower stem reaches a height of 6 to 22 cm, the one or two inflorescences are coiled and bear 2 to 19 flowers . The petals are white, rarely pink, around 4 mm long and 2 to 3 mm wide. The approximately round ovary forms numerous dark brown to black seeds after successful pollination .
The number of chromosomes is 2n = 20.
distribution
The species is widespread in Australasia , from China to East and Southeast Asia to Australia . It thrives on shaded, wet surfaces at altitudes of up to 1500 m.
Systematics
The species was first described by Martin Vahl in 1794 . Together with the morphologically extremely similar and closely related Drosera sessilifolia , it forms the subgenus Thelocalyx of the sundew.
The epithet chose Vahl orthographic wrong, correct would burmannii . However, due to botanical nomenclature rules, the name may not be corrected.
use
Drosera burmanni is largely insignificant for humans as a useful plant. It is occasionally cultivated by lovers. In Asian countries - like other sundew species - it is collected in large quantities as a medicinal plant and exported to European countries, among others. Since the collections are not sustainable, Drosera burmanni is partially threatened locally by over-collection, for example in Andhra Pradesh, India .
proof
- ↑ a b c d e Lianli Lu, Katsuhiko Kondo: Droseraceae. In: Flora of China. Volume 8: Brassicaceae through Saxifragaceae. Science Press et al., Beijing et al. 2001, ISBN 0-915279-93-2 , p. 199.
- ^ Wilhelm Barthlott , Stefan Porembski, Rüdiger Seine, Inge Theisen: Carnivores. Biology and culture of carnivorous plants. Ulmer, Stuttgart 2004, ISBN 3-8001-4144-2 , p. 104.
- ^ Drosera burmannii at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ Ludwig Diels : Droseraceae (= The Plant Kingdom . 26 = 4, 112, ZDB -ID 846151-x ). Engelmann, Leipzig 1906, p. 74.
- ↑ Kottapalli Jayaram, Majeti NV Prasad: Drosera indica L. and D. burmanii Vahl., Medicinally important insectivorous plants in Andhra Pradesh - regional threats and conservation. In: Current Science. 91, No. 7, 2006, ISSN 0011-3891 , pp. 943-946 .
Web links
- Drosera burmanni inthe IUCN Red List of Threatened Species 2013.2. Posted by: Zhuang, X., 2010. Retrieved May 5, 2014.