Drosera paleacea
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Drosera paleacea , flower |
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Drosera paleacea is a carnivorous plant from the genus sundew ( Drosera ). It belongs to the group of so-called dwarf sundews and is native to southwestern Australia.
description
Drosera paleacea is a perennial herbaceous plant . This forms a compact, rosette-shaped bud of horizontal leaves with a diameter of about 1.5 cm. The stem axis is 1 cm long and covered with withered leaves from the preseason.
The bud of the stipules is ovate, fringed, 5 mm long and 3 mm in diameter at the base. The stipules themselves are 4 mm long, 3 mm wide and three-lobed. The middle lobe is divided into 3 segments.
The leaf blades are approximately circular and up to 2 mm in diameter. The longer tentacle glands are on the edge, the shorter ones on the inside. Some hairs can be seen on the underside. The leaf stalks are up to 5 mm long, 0.5 mm wide and taper to the leaf blade. They are covered on the underside with only a few, small glandular hairs.
Flowering time is November to January. The one to four flower stems are up to 3 cm long and sparingly covered with a few tiny hairs. The inflorescence is a compact coil of more than 30 flowers on approximately 1.5 mm long pedicels. The lance-shaped sepals are 1.5 mm long and 0.7 mm wide. The edges are pointed and notched. The surface is smooth. The white petals are tightly inverted ovate, 2.5 mm long and 1 mm wide.
The five stamens are 1.5 mm long. The threads are greenish-white, the anthers and pollen are white. The greenish-white ovary is spherical, 0.5 mm long and 0.4 mm in diameter. The 3 greenish-white, horizontally stretched stylus are less than 0.1 mm long. The scars are also greenish-white, sickle-shaped, 0.4 mm long and three times the diameter of the stylus .
The formation of brood scales is typical of dwarf sundews.The broad, egg-shaped, 0.7 mm thick brood scales are formed in large numbers from late November to early December and are approx. 1 mm long and 0.8 mm wide.
The number of chromosomes is 2n = 10.
Distribution, habitat and status
Drosera paleacea occurs only on a small area in the extreme southwest of Australia. The plant thrives there in silica-containing sand on the edges of swamps on higher areas. 'D. paleacea 'grows together with Banksia menziesii north and south of Perth . It is also found in the Darling Range region east of Perth, where it can only be found on small areas of sand containing silica.
Systematics
The name paleacea means "with chaff scales". This species was described as early as 1824 and should therefore be one of the earliest discovered dwarf sundew species.
In 1996 Jan Schlauer introduced the taxa Drosera leioblastus , Drosera roseana and Drosera stelliflora as subspecies of Drosera paleacea , Allen Lowrie only accepted the subspecies in addition to the nominate subspecies:
- Drosera paleacea subsp. trichocaulis
swell
- Allen Lowrie: Carnivorous Plants of Australia. Volume 2. University of Western Australia Press, Nedlands 1989, ISBN 0-85564-300-5 , p. 126.
Individual evidence
- ^ Drosera paleacea at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
- ↑ Jan Schlauer: A dichotomous key to the genus Drosera L. (Droseraceae). In: Carnivorous Plant Newsletter. Vol. 25, 1996, ISSN 0190-9215 , pp. 67-88, ( digital version (PDF; 1 MB) ).
- ↑ Allen Lowrie, John G. Conran: A revision of the Drosera omissa / D. nitidula complex (Droseraceae) from south-west Western Australia. In: Taxon. Vol. 56, No. 2, 2007, ISSN 0040-0262 , pp. 533-544, JSTOR 25065808 .
