Drosera nitidula
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Drosera nitidula , flower |
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Drosera nitidula is a carnivorous plant belonging to the genus sundew ( Drosera ). It belongs to the group of so-called dwarf sundews and is native to southwestern Australia.
description
Drosera nitidula is a perennial herbaceous plant . This forms a flat, compact, rosette-shaped bud from horizontal leaves with a diameter of about 1.5 cm. The stem axis is about 5 mm long and covered with the withered leaves of the preseason.
The bud of the stipules is egg-shaped, 5 mm long, 3 mm in diameter and somewhat “buried” under the young leaves. The stipules themselves are 3.5 mm long, 4 mm wide and three-lobed. The middle lobe is divided into 3 segments.
The leaf blades are approximately circular, 2.5 mm long and 2 mm wide. The longer tentacle glands are on the edge and about 1.5 mm along the petioles, the shorter ones on the inside. There are some glands on the underside. The leaf stalks are up to 5.5 mm long, 0.7 mm at the base, widen to 0.8 mm in the middle and taper to 0.5 mm at the leaf blade. They are half lanceolate and covered with tiny hairs everywhere.
Flowering time is November to January. The one or two flower stalks are 2.5 cm long and completely covered with glands. The inflorescence is a coil of 4 to 12 flowers on approximately 3.5 mm long peduncles. The egg-shaped sepals are 2 mm long and 0.9 mm wide. The edges are smooth and the tips are somewhat serrated. The surface is covered with cylindrical, red-headed glands. The white petals are inverted ovate, 3.3 mm long and 2 mm wide. The base of the petals forms a wedge-shaped, greenish finger 1 mm long and 0.3 mm wide.
The five stamens are 1.3 mm long. The threads are white, the anthers are red and the pollen are yellow. The pale green ovary is inverted ovoid, 0.8 mm long and 1 mm in diameter. The 3, often 4 white, horizontally stretched styluses are 0.4 mm long. The scars are blood red and kidney shaped.
The formation of brood scales is typical of dwarf sundews.The lance-shaped, 0.4 mm thick brood scales are formed in large numbers from late November to early December and are approx. 1.4 mm long and 1 mm wide.
The number of chromosomes is 2n = 28.
Distribution, habitat and status
Drosera nitidula occurs only on a small area in the extreme southwest of Australia. The plant thrives there on the edge of damp depressions in loam or sandy clay soils.
The known populations are between Gingin and Pinjarra , in the Scott River Region and at Esperance .
Systematics
Besides the nominate three subspecies have long been recognized ( Drosera nitidula ssp. Omissa , Drosera nitidula ssp. Leucostigma , Drosera nitidula ssp. Allantostigma ), the exact rank was not without controversy, January Sly and Wilhelm Barthlott classified the two subspecies leucostigma and allantostigma one as varieties . Following a revision in 2007, however, the corresponding subspecies all enjoy species rank. All identifiers were retained with the exception of Drosera nitidula ssp. omissa , whose name turned out to be invalid and was therefore replaced by Drosera patens .
literature
- Ludwig Diels : Droseraceae (= The Plant Kingdom . 26 = 4, 112, ZDB -ID 846151-x ). Engelmann, Leipzig 1906, (The book contains the most important monograph of the Drosera genus .).
- Allen Lowrie: Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 .
Individual evidence
- ↑ Drosera nitidula at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ^ Wilhelm Barthlott, Stefan Porembski, Rüdiger Seine, Inge Theisen: Carnivores. Biology and culture of carnivorous plants. Ulmer, Stuttgart 2004, ISBN 3-8001-4144-2 .
- ↑ Allen Lowrie, John G. Conran: A revision of the Drosera omissa / D. nitidula complex (Droseraceae) from south-west Western Australia. In: Taxon. Vol. 56, No. 2, 2007, ISSN 0040-0262 , pp. 533-544, JSTOR 25065808 .
