Drosera androsacea
| Drosera androsacea | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Drosera androsacea | ||||||||||||
| Diels |
Drosera androsacea is a carnivorous plant belonging to the genus sundew ( Drosera ). It belongs to the dwarf sundew and was first described in 1904.
description
Drosera androsacea is a perennial herbaceous plant with fine, fibrous roots. The plant forms a rosette, remains small and hardly reaches more than 2 cm in diameter. It has only a small stem on which few or no leaves from the previous season remain. During the flowering period, this species only develops about 5 catch leaves.
The bud of the stipules is smooth and conical in shape, 5 mm high and 3 mm wide at the base. When the plant blooms, the diameter of the stipple bud decreases. The stipules , which are formed to withstand the hot summer on the Australian southeast coast, are 3 mm long, 1 to 1.2 mm wide and trilobed. The middle lobe is usually with entire margins, sometimes divided into 2 sections just below the tip. The lateral lobes have entire margins with a pointed tip.
The leaf stalks are up to 4.5 mm long, 0.7 mm wide at the base, 0.9 mm wide in the middle, and taper to 0.6 mm near the leaf blades . These are almost circular, 2.5 mm long, 2.7 mm wide and hairless on the underside. Long tentacles sit on the edge, while the inside are rather short.
Flowering time is November to December. The flower stem is up to 5 cm long and covered with tiny glands. The inflorescence is a winding of four to seven flowers on also occupied with short-stalked glands and approximately 3 mm long flower stems . The 2.5 mm long and 1.5 mm wide sepals are covered with a few short-stalked, red glands, ovate and irregularly serrated. The egg-shaped petals are pink to white, 5 mm long and 3.5 mm wide. The ovary is pentagonal with 0.9 mm diameter and 0.8 mm long. The 5 white styluses are up to 3 mm long. The five stamens are 2.2 mm long, translucent white and pink at the tip. The anthers are white and the pollen is dark pink.
The formation of brood scales is typical of dwarf sunnies : The inverted egg-shaped brood scales are formed in large numbers from late November to early December and are 1 mm long, 0.9 mm wide and 0.5 mm thick.
Distribution, habitat and status
Drosera androsacea occurs only in the extreme southwest of Australia, between Perth and Esperance . The endemic plant thrives there mainly on stony, sandy-loamy soils in low, open pastureland. In summer these floors dry out completely and become hard.
Known populations are in the Sterling Range and Williams .
Drosera androsacea is not uncommon, threatened or introduced in Western Australia.
Systematics
The name " androsacea " comes from the plant genus Androsace (dt. Mannsschild ), a primrose plant. Drosera androsacea was described as a species by Diels in 1904.
This species is mainly distinguished by the greyish-green, pentagonal, pointed and conical bud of stipules.
literature
- Allen Lowrie : Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 , p. 22.