Drosera gigantea
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Drosera gigantea |
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| Drosera gigantea | ||||||||||||
| Lindl. |
Drosera gigantea is a carnivorous plant from the genus sundew ( Drosera ). It wasfirst describedby John Lindley in 1839.
description
Drosera gigantea is an upright, robust, greyish-green, hairless and up to 1 m high plant. It is sometimes completely burgundy and has many side branches that also branch. In the early flowering phase, the catch leaves are only found along the branches. In the further growth phase, groups of 2 or 3 leaves form. The lower part of the upright Stämmchens can reach up to 1 cm in diameter and with many pfriemförmigen , bare, 8 mm long supporting sheets covered. Similar bracts, which differ in size, are located in the direction of the plant tip on the leaf axils.
The leaf blades are sickle-shaped , 2.5 mm long and 3.5 mm wide with 3 mm long lobes at the angles and point outwards. Longer tentacle glands are located along the deeply concave edge, smaller tentacle glands inside. The leaf stalks are flattened round, slender, 8 to 10 mm long and tapering to a point.
Flowering time is from August to December. The grape-like inflorescence sits at the top of the plant as well as on the side branches and consists of many white flowers on 3 to 8 mm long pedicels . The sepals are rust-orange, egg-shaped, 3 mm long and 1.5 mm wide. The margins are whole , the tips pointed, often serrated , glabrous and dotted with black. The petals are obovate, 5.5 mm long and 2.5 mm wide with slightly notched tips. The 5 stamens are 1.5 mm long, the filaments and the anthers are white, the pollen yellow. The ovary is dark brown, almost black, warty, approximately spherical, 1 mm in diameter and 0.8 mm long. The three styles are rust-orange, 0.8 mm long and divided into a few, rather thick, flattened round segments in the upper third. The scars are white and irregularly swollen. They are at the top of each short pen segment.
The tuber is red, elliptical across, has a diameter of around 3 cm, a length of 1.5 cm and has no paper-like leaf sheath. The vertical runners are embedded in a dense column made of old root material and are up to 60 cm long. Like all so-called "Tuberous Drosera", it retreats into this tuber at times of high temperatures and relative dryness and survives underground.
The number of chromosomes is 2n = 28.
Distribution, habitat and status
The species is endemic to the Albany , Perth and Jurien areas of southwest Australia. It thrives there on the edges of swamps, lakes and granite outcrops. Often the plant even stands in water. Drosera gigantea also grows in pools and sandy clay floods on moist soils on raised ground.
Systematics
Drosera gigantea belongs to the subgenus Ergaleium , Ergaleium section, i.e. to the climbing bulbous drosera.
literature
- Allen Lowrie : Carnivorous Plants of Australia. Volume 1. University of Western Australia Press, Nedlands 1987, ISBN 0-85564-253-X , p. 20.
Individual evidence
- ↑ Drosera gigantea at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis