Drosera pycnoblasta
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Drosera pycnoblasta |
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| Diels |
Drosera pycnoblasta 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 pycnoblasta is a perennial herbaceous plant . This forms a compact, rosette-shaped bud made of horizontal leaves with a diameter of about 1.5 cm. The stem axis is 1 cm long and only covered with few or no withered leaves from the preseason.
The bud of the stipules is broadly obovate , 4 mm long and 5 mm in diameter at the base. The stipules themselves are 3.5 mm long, 2.5 mm wide and three-lobed. The middle lobe is smooth and only the tip is minimally serrated. The edges of the outer lobes are smooth, the tips minimally serrated and just as long as the middle lobe.
The leaf blades are circular and 2 mm in diameter. The longer tentacle glands are on the edge, the shorter ones on the inside. There are a few glands on the underside. The leaf stalks are up to 6 mm long, 0.5 mm at the base, expand immediately to 1.3 mm and taper to 0.5 mm at the leaf blade. They are semi-lanceolate, with a slight keel on the underside along the petiole and completely covered with a few tiny glands.
Flowering time is October to November. The one or two flower stalks are 9 cm long, and the lower section is sparsely covered with glands. There are slightly more glands at the top. The inflorescence is a coil of 8 flowers on approximately 2.5 mm long pedicels. The elliptical sepals are 2 mm long and 1.1 to 1.5 mm wide. The margins are whole , the tips broken off and slightly serrated. The entire surface is covered with cylindrical, red-headed glands. The petals are white, rarely pale pink with a reddish spot near the base and veined pink. They are obovate , 5 mm long and 3 mm wide.
The five stamens are 1.8 mm long. The stamens are greenish-white, the anthers white and the pollen yellow. The green ovary is top-shaped, 0.8 mm long and 1 mm in diameter. The 3 white, horizontally stretched stylus are 0.5 mm long and 0.2 mm in diameter. The scars are white. The stylus-scar section is a total of 2.5 mm long, 0.2 mm in diameter and tapers abruptly to the last 0.5 mm at the tip.
The formation of brood scales is typical for dwarf sundews.The broad, egg-shaped, 0.5 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 pycnoblasta occurs only on a small area in the extreme southwest of Australia. The plant thrives there on white siliceous sand and yellow sandy soils in low open heathland. Known populations are at Pingelly , Tammin, and Goomalling . Drosera pycnoblasta differs from all other species by the smooth, white, shiny and spherical bud of stipules.
Systematics
The name "pycnoblasta" refers to the dense bud of stipules ("pycno" = dense).
literature
- Allen Lowrie: Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 , p. 146.
