Drosera parvula
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Drosera parvula |
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| NGMarchant & Lowrie |
Drosera parvula is a carnivorous plant belonging to the genus sundew ( Drosera ). It belongs to the group of so-called dwarf sundews and is native to southwestern Australia.
description
Drosera parvula is a perennial herbaceous plant . This forms an open, rosette-shaped bud of horizontal and semi-upright leaves with a diameter of about 1.5 cm. The stem axis is also 1.5 cm long and covered with the withered leaves of the previous season.
The bud of the stipules is ovate, fringed, including the 4 mm long, bearded section at the tip, 9 mm long and 3 mm in diameter at the base. The stipules themselves are 6 mm long, 3 mm wide and three-lobed. The middle lobe is divided into 3 segments. Each of these segments is finely fringed at the top. The lowest tip is 2 mm longer than the longest tip of the central lobe.
The leaf blades are approximately circular, 1 mm long and 0.9 mm wide. The longer tentacle glands are on the edge, the shorter ones on the inside. There are some glands on the underside. The leaf stalks are up to 4 mm long, 0.7 mm at the base, taper to 0.2 mm at the leaf blade. They are lance-shaped in parts and covered with a few tiny glands on their entire surface.
Flowering time is October to December. The two to many flower stalks are 5 cm long, thread-like and sparingly occupied with only a few glands. The inflorescence is a coil of 12 to 15 flowers on about 1 mm long pedicels. The egg-shaped sepals are 1.5 mm long and 0.8 mm wide. The edges are smooth and the tips serrated and covered with a few short, cylindrical glands on the surface. The white petals have a yellow finger-shaped section at the base and a red-brown point just above this give part. They are inverted ovoid, 3.2 mm long and 2 mm wide.
The five stamens are 0.7 mm long. The threads are white, the anthers pink and the pollen yellow. The pale green ovary is shell-shaped, 0.5 mm long and 0.5 mm in diameter. The 3 to 4 white, almost horizontally stretched styluses are 1.5 mm long. The stylus-scar arrangement tapers evenly to the rounded tip. The scar section is on the upper half.
The formation of brood scales is typical for dwarf sundews.The egg-shaped, 0.8 mm thick brood scales are formed in large numbers from late November to early December and are approx. 0.9 mm long and 0.8 mm wide.
Distribution, habitat and status
Drosera parvula occurs only on a small area in the extreme southwest of Australia. The plant only thrives there on white sand containing silica. Known populations are found at Cataby , Wanneroo, and Pinjarra .
Systematics
The name "parvula" comes from Latin and means "small sundew" ("parvus" = very small)
literature
- Allen Lowrie: Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 , p. 134.
