Drosera oreopodion
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Drosera oreopodion , flower |
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| NGMarchant & Lowrie |
Drosera oreopodion is a carnivorous plant of the genus sundew ( Drosera ). It belongs to the group of so-called dwarf sundews and is native to southwestern Australia.
description
Drosera oreopodion 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 about 8 mm long and covered with the withered leaves of the preseason.
The bud of the stipules is narrowly ovate, smooth, 6 mm long and 3 mm in diameter at the base. The stipules themselves are 2.5 mm long, 1.8 mm wide and three-lobed. The middle lobe is divided into 3 segments in the upper third of the length. Each of these segments is fringed at the top. The edges of the outer lobes are somewhat serrated near the tip.
The leaf blades are approximately circular, 1.5 mm long and 1.7 mm wide. The longer tentacle glands are on the edge, the shorter ones on the inside. The underside is bare. The leaf stalks are up to 4 mm long, 0.4 mm at the base, widen to 0.8 mm in the middle and taper to 0.6 mm at the leaf blade. They are semi-lanceolate with a few glands on the lower surface near the leaf blade, otherwise glabrous.
Flowering time is September to October. The flower stem is up to 3.5 cm long and covered with tiny glands along the entire stem . The inflorescence is a coil of 8 to 12 flowers on approximately 2 mm long pedicels. The lance-shaped sepals are 2 mm long and 0.8 mm wide. The upper margins and tips are irregularly warty. The entire surface is covered with a few cylindrical glands. The white petals are inverted ovate, 4 mm long and 2 mm wide. They are littered with conspicuous veins over almost their entire length.
The five stamens are 1.7 mm long. The threads, the anthers and the pollen are white. The white ovary is inverted ovoid, 0.6 mm long and 0.6 mm in diameter. The 3 white, horizontal styluses are 0.15 mm long and 0.05 mm in diameter. The scars are white, semi-upright, 0.05 mm in diameter, expand to 0.15 mm in the middle and taper slightly to the rounded tip.
The formation of brood scales is typical of dwarf sundews.The elliptical, 0.6 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 oreopodion occurs only on a small area in the extreme southwest of Australia. According to new evidence, a smaller population is also found in the north of Western Australia. The plant thrives there in open heathland on loamy sand that is sometimes mixed with laterite granules. The known populations are at Armadale and Pinjarra .
Systematics
The name "oreopodion" means "At the foot of the mountain" and refers to the foot of the Darling Range .
swell
- Allen Lowrie: Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 , p. 122.
- http://florabase.calm.wa.gov.au/browse/map/13189
