Drosera allantostigma
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Drosera allantostigma |
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| Drosera allantostigma | ||||||||||||
| ( NGMarchant & Lowrie ) Lowrie & Conran |
Drosera allantostigma is a carnivorous species of the sundew genus. It belongs to the dwarf sundew and was described as a species in May 2007.
description
Drosera allantostigma is a small, perennial, herbaceous plant with fine, fibrous roots. The rosette-shaped growing species reaches a diameter of 1 to 2 cm and a height of up to 8 mm.
The leaf stalks are approximately linear, slightly tapering, strongly flattened ovate in cross section, 3.5 to 6 mm long, 0.75 to 0.7 mm wide, tapering to 0.3 to 0.4 mm at the extreme point and with numerous, tiny glands occupied. The leaf blades are elliptical to obovate, 1.5 to 2.5 mm long and 1 to 2 mm wide. The leaves are green at the base and reddish towards the end.
The bud, formed from stipules and covered with hairs, is broadly ovate, fringed, 4 to 7 mm high and 3.5 to 4 mm in diameter. The single stipple is 3.5 to 4.5 mm long and 3 to 4 mm wide and has three lobes. The middle lobe is divided into three sections, each with two to three fringes, the side lobes have four fringes on the inner edges.
The inflorescence axis is 4 to 8 cm long with inflorescence , without 3 to 5.5 cm long and sparsely occupied with short-stalked glands. The inflorescence is a wrap , the flower stalks are 5 to 6 mm long at flowering time, with ripe fruits up to 1 cm long. The bracts are awl-shaped and covered with glandular hairs.
There are twelve to twenty flowers on the inflorescences . The 1.7 to 2.0 mm long and 0.8 to 1.0 mm wide sepals are egg-shaped. The wedge-shaped to obovate petals are white with a pink central rib, 3.5 to 4.5 mm long and 2.5 to 2.8 mm wide.
The anthers are white, the pollen orange. The ovary is obovate, 0.8 mm long and 0.9 mm in diameter. The three to four stigmas are sausage-shaped and chestnut-red.
The brood scales formed in the center are approximately round, two-lobed at the base, flattened at the end, 1 mm long, 0.9 mm wide and 0.5 mm thick.
Distribution, habitat and status
Of Drosera allantostigma few populations in a radius of 10 kilometers around the place where the type specimen are north of Hill River in the southwest of Western Australia known. It thrives there on clay, sand or peat-sand soils on the edge of winter-humid depressions.
The species is currently classified as Priority One in Western Australia , a level for taxa that are little known and rare and that are currently considered to be endangered.
Systematics
Drosera allantostigma was originally classified as a subspecies of Drosera nitidula in 1992 and was only described as an independent species in 2007 as part of a revision of the Drosera nitidula complex.
Drosera allantostigma is a dwarf sundew and as such belongs to the section Bryastrum in the subgenus Drosera . The closest related species is Drosera omissa , with which Drosera allantostigma hybridizes in nature.
The name "allantostigma" is derived from Latin and means "sausage-shaped scar" (allantoideus = sausage-shaped; stigma = scar)
There are also natural hybrids with Drosera omissa , which were found north of Cataby in the Hill River region. A hybrid was found south of Pingelly , which later turned out to be a cross between Drosera nitidula and Drosera omissa .
literature
- 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 .
