Drosera bulbigena
| Drosera bulbigena | ||||||||||||
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| Scientific name | ||||||||||||
| Drosera bulbigena | ||||||||||||
| Morrison |
Drosera bulbigena is a carnivorous plant belonging to the genus sundew ( Drosera ). It was first described by A. Morrison in 1903.
description
Drosera bulbigena is a small, perennial, herbaceous, curved plant with 1 to 2 awl-shaped bracts on the lower part of the stem axis . The stem reaches lengths of 3 to 6 cm with up to 12 individual leaves along the upright stem.
The leaf blades are kidney-shaped , approximately shield-shaped, 2 mm long and 2.5 mm wide. They point outwards and a little downwards. Longer tentacle glands are located along the slightly concave edge. Smaller tentacle glands inside. The leaf stalks are flattened round, 2 mm long, 0.3 mm wide, slightly tapering and completely glabrous.
Flowering time is from August to September. The inflorescence sits at the top of the plant and consists of 1 to 3 white flowers on 2 to 4 mm long, hairless pedicels . The sepals are golden green, lanceolate, 2 mm long and 1 mm wide. The edges and the tip are deeply fringed with long, narrow, awl-shaped fringes, which are provided with a small gland, but otherwise hairless. The petals are broadly obovate, 5.5 mm long and 4 mm wide, their outer end is trimmed and serrated. The 5 stamens are 2.5 mm long, the stamens are white, the anthers are white with pink splashes, the pollen is yellow. The ovary is green, almost spherical, 1 mm in diameter and 0.8 mm long. The three styluses are white, reddish at the base, 1.5 mm long and divided into a few thread-like, simple and once forked segments. Each segment tapers to a point at the top. The stigma is white and shaped at the tip of the stylus segment.
The tuber is red, spherical, has a diameter of around 2 mm and is enclosed by a black, paper-like leaf sheath at the end of a 4 cm long, vertical runners. Like all so-called "Tuberous Drosera", it retreats into this tuber at times of high temperatures and relative dryness and survives underground. Drosera bulbigena regularly forms 1 to 2 adventitious roots from the vertical runners. These adventitious roots form additional tubers that grow into independent plants in the following growing season. The mother tuber also regenerates every season.
Distribution, habitat and status
The species is endemic to the Pinjarra and Coolup area in southwest Australia. It thrives there on the edges of swamps and low-lying areas on winter-moist peaty sandy soils.
Systematics
Drosera bulbigena belongs to the subgenus Ergaleium , Ergaleium section, i.e. to the climbing bulbous drosera. It is similar to Drosera radicans and can easily be confused with it, but in contrast to this it has red bulbs and forked pistils.
literature
- Allen Lowrie : Carnivorous Plants of Australia. Volume 1. University of Western Australia Press, Nedlands 1987, ISBN 0-85564-253-X , p. 16.