Drosera binata
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Drosera binata |
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| Drosera binata | ||||||||||||
| Labill. |
Drosera binata is a carnivorous plant belonging to the genus sundew ( Drosera ). She is the only representative of the Phycopsis section.
description
Drosera binata is a perennial, herbaceous plant with a rosette-shaped growth. It has fleshy roots that serve as a storage organ in the dry season and from which the plant then sprouts again.
The 5 to 15 centimeters long and 1.5 to 2 millimeters wide, forked leaf blades sit on thin, up to 30 centimeters long, upright stems. The leaf blades are usually simply forked, but can also be forked two to twenty times. Tentacles are only found on the leaf blades, the long petioles are smooth.
The one to two racemose and branched, completely hairless inflorescences can carry up to 50 flowers, the inflorescence stalk becomes 10 to 100 centimeters long, the flower stalks up to 6 millimeters long. The approximately 2 millimeter long bracts are linear.
The egg-shaped sepals are up to 3.5 millimeters long and 2 millimeters wide, the up to 6 millimeters long and 5 millimeters wide petals are white, inverted-egg-shaped, flattened at the extreme point and serrated.
The flowers are hermaphroditic and not dichogamous . However, there are both populations in which self-pollination is possible and self-incompatible populations in which pollen of the same genotype is killed by the female part of the flower.
The seed capsules are oval, the numerous fine seeds are elongated.
Depending on the author, the number of chromosomes is 2n = 32, 46 or 64.
Occurrence
Drosera binata is native to eastern Australia, Tasmania and New Zealand. It thrives there on peaty sandy soils in heather vegetation .
Botanical history
Drosera binata was discovered in 1792, first described by Labillardière in 1805, and reached the Kew Botanical Garden in 1823 when substrates were delivered .
Numerous synonyms, varieties and forms exist, in 1836 Constantine Samuel Rafinesque even placed the species in its own genus as Dismophyla binata . None of the taxa are currently recognized.
However, there are two of these taxa in circles lovers use, it is of bifurcate forms as var. Multifida Mazrimas and var six-forked forms as ". multifida f. extrema ”. These names are not valid taxa, but nomina nuda .
literature
- Wilhelm Barthlott , Stefan Porembski, Rüdiger Seine, Inge Theisen: Carnivores. Biology and culture of carnivorous plants. Ulmer, Stuttgart 2004, ISBN 3-8001-4144-2 .
- Ludwig Diels : Droseraceae (= The Plant Kingdom . 26 = 4, 112, ZDB -ID 846151-x ). Engelmann, Leipzig 1906, pp. 105-106.
- Allen Lowrie : Carnivorous. Plants of Australia. Volume 3. University of Western Australia Press, Nedlands 1998, ISBN 1-875560-59-9 , pp. 152-155.
Individual evidence
- ↑ Flower Self-incompatibility. ICPS, accessed on August 12, 2018 .
- ^ Drosera binata at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ Drosera Chromosomes. ICPS, accessed on August 13, 2018 .
- ↑ Rick Walker: Carnivorous Plant Database. ( omnisterra.com ) Accessed February 15, 2007.
