Drosera hamiltonii

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Drosera hamiltonii
Drosera hamiltonii, flower

Drosera hamiltonii , flower

Systematics
Eudicotyledons
Nuclear eudicotyledons
Order : Clove-like (Caryophyllales)
Family : Sundew family (Droseraceae)
Genre : Sundew ( Drosera )
Type : Drosera hamiltonii
Scientific name
Drosera hamiltonii
CRPAndrews
Leaf rosette of Drosera hamiltonii

Drosera hamiltonii is a carnivorous plant belonging to the genus Sundew ( Drosera ). It occurs only in a small area in the extreme southwest of Australia.

description

Drosera hamiltonii is a perennial, herbaceous plant that forms a native rosette from a short rhizome . Their well-developed root system consists of black, thick and branched roots.

The leaf rosette reaches a diameter of 4 to 6 cm. It has spatulate, 3 to 4 centimeters long catch leaves with a width of up to 1 centimeter and tapers to the 4 millimeter long and 3 millimeter wide petiole. On the flat top of the leaf, neither the midrib nor the leaf veins can be seen . The tentacles are evenly distributed on the upper side of the leaf, the underside of the leaf is hairless.

Flowering time at the natural site is November to December. The flowers only open every two days. The very hairy and dark red haze, 30 to 40 centimeters (occasionally up to 75 centimeters) long flower stalk bears twenty to thirty pink flowers in a cluster on 3 to 5 millimeter long flower stalks covered with glandular hairs . The narrow, egg-shaped sepals are 7.5 millimeters long and 3 millimeters wide, spotted with black and scattered with cylindrical, red-headed glandular hairs. The dark pink, very wide, obovate petals are 1.6 inches long and 2.2 inches wide, the veins stand out on the underside with a darker color. The edges are simple, irregularly notched at the extreme end.

The five stamens are up to 5.5 millimeters long, the stamens white, the anthers and the pollen yellow. The five 2.2 mm long stylus bloom are longitudinally united, the purple scars lanceolate, 0.8 millimeters long and 0.4 millimeters wide and at the upper edges and at the outermost end papillate .

The number of chromosomes is 2n = 28.

distribution

This plant species can only be found in the extreme southwest of Australia along the coast between Albany and Augusta on wet peat soils in swamps and on the banks of flowing waters.

It thrives there under dense vegetation together with plants such as Utricularia paulineae , Utricularia menziesii , the dwarf jug ( Cephalotus follicularis ) and Drosera pulchella .

The habitats are increasingly being destroyed by agricultural activities and the population is threatened. However, a protection status does not yet exist.

Systematics

The species was first described by Cecil Rollo Payton Andrews in 1903 and classified by Diels in 1906 as the only species in the Stelogyne section . Schlauer even described the section as a separate sub-genus in 1996. Seine & Barthlott placed the species in the Drosera section in 1994 , but this view could not prevail. They see phylogenetic studies as part of a smaller clade with, among others, Drosera indica and Drosera adelae . Taking these findings into account, A.Fleischm. , PMGonella & F.Rivadavia again used the section rank .

Individual evidence

Footnotes directly behind a statement cover the individual statement, footnotes directly behind a punctuation mark the entire preceding sentence. Footnotes after a space refer to the entire preceding paragraph.

  1. ↑ a b c d e f g Allen Lowrie : Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 , pp. 182-185.
  2. ↑ a b c d Richard Davion: Drosera hamiltonii. In: Bulletin of the Australian Carnivorous Plant Society. Vol. 21, No. 2, 2002, ISSN  0813-135X , pp. 12-14.
  3. ^ Drosera hamiltonii at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
  4. ^ Allen Lowrie: A new species of Utricularia (Lentibulariaceae) from the south-west of Western Australia. In: Nuytsia . Vol. 12, No. 1, 1998, pp. 37-41 .
  5. ↑ florabase.dec.wa.gov.au: Drosera hamiltonii CRPAndrews: FloraBase: Flora of Western Australia , accessed September 27, 2012
  6. ↑ Ludwig Diels: Droseraceae . In: A. Engler (Ed.): The plant kingdom . Issue 26. Leipzig 1906, p. 103-105 ( biodiversitylibrary.org ).
  7. ↑ Jan Schlauer: A dichotomous key to the genus Drosera L. (Droseraceae) . In: Carnivorous Plant Newsletter . tape 25 , no. 3 , 1996, p. 68 ( carnivorousplants.org [PDF]).
  8. ^ Rüdiger Seine & Wilhelm Barthlott: Some Proposals on the Infrageneric Classification of Drosera L. In: Taxon . tape 43 , no. 4 , November 1994, pp. 584 .
  9. ↑ Fernando Rivadavia, Katsuhiko Kondo, Masahiro Kato, Mitsuyasu Hasebe: Phylogeny of the sundews, Drosera (Droseraceae), based on chloroplast rbcL and nuclear 18S ribosomal DNA sequences. In: American Journal of Botany. Vol. 90, No. 1, 2003, ISSN  0002-9122 , pp. 123-130, doi : 10.3732 / ajb.90.1.123 .
  10. ↑ Andreas Fleischmann, Paulo Minatel Gonella & Fernando Rivadavia: A new name for the Sectional Brazilian tetraploid clade of Drosera subgenus Drosera . In: Carnivorous Plant Newsletter . tape 47 , no. 1 , p. 4 ( carnivorousplants.org [PDF]).

Web links

Commons : Drosera hamiltonii  - Collection of images, videos and audio files