Drosera bulbigena

Drosera bulbigena is a carnivorous plant in the genus Sundew ( Drosera ). It was first described in 1903 by A. Morrison.

Description

Drosera bulbigena is a small, perennial, herbaceous plant with curved 1-2 pfriemförmigen bracts on the lower part of the stem axis. The shoot axis reaches lengths of 3 to 6 cm with up to 12 individually standing upright leaves along the stem.

The leaf blades are kidney-shaped, roughly shield-shaped, 2 mm long and 2.5 mm wide. They face outwards and slightly downwards. Longer tentacles glands are located along the slightly concave edge. Smaller tentacles glands inside. The leaf stalks are flattened round, 2 mm long, 0.3 mm wide, slightly tapered and completely bald.

Bloom time is from August to September. The inflorescence sits at the top of the plant and consists of 1-3 white flowers on 2 to 4 mm long, glabrous pedicels. The sepals are gold green, lanceolate, 2 mm long and 1 mm wide. The edges and tip are deeply fringed with long, narrow, pfriemförmigen fringes, which are provided with a small gland, but otherwise glabrous. The petals are broadly obovate, 5.5 mm long and 4 mm wide, its outer end is trimmed and perforated. The 5 stamens are 2.5 mm long, the stamens are white, the anthers 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 pens are white, reddish at the base, 1.5 mm long, and divided into a few thread-like, and easily once bifurcated segments. Each segment tapers to a point at the top. The scar is white and shaped at the tip of stylus segment.

The bulb is red, spherical, has a diameter of approximately 2 mm and is surrounded by a black, papery leaf sheath at the end of a 4 -cm-long, vertical tail. Like all so-called " Knollendrosera " it contracts during periods of high temperatures and relative drought in these tuber back and survived underground. Drosera bulbigena regularly trains 1-2 adventitious roots from the vertical runners. These adventitious roots form additional tubers that grow in the following Wachtumsperiode into independent plants. The mother tuber also regenerated each season.

Distribution, habitat and status

The species is endemic to the area of Pinjarra and Coolup in southwestern Australia. It thrives there on the edges of swamps and low-lying areas on winter wet peaty sandy soils.

System

Drosera bulbigena belongs to the subgenus Ergaleium, Section Ergaleium, so the climbing Knollendrosera. It is similar to Drosera radicans and can easily be mistaken for it, but, in contrast to the red tubers and forked stylus.

Swell

• Allen Lowrie: Carnivorous Plants of Australia, Vol 1, Nedlands, 1987, p 16

• Sundew Family
• Insect-eating plant
• Droseraceae