Drosera leucostigma
| Drosera leucostigma | ||||||||||||
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Drosera leucostigma , flower |
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| Scientific name | ||||||||||||
| Drosera leucostigma | ||||||||||||
| ( NGMarchant & Lowrie ) Lowrie & Conran |
Drosera leucostigma 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 leucostigma is a small, perennial, herbaceous plant with fine, fibrous roots. The rosette-shaped growing species reaches a diameter of 10 to 20 millimeters and a height of up to 5 millimeters.
The leaf stalks are approximately linear, slightly tapering, strongly flattened-ovoid in cross section, 4.5 to 6 millimeters long, 0.4 to 0.5 millimeters wide, tapered at the extreme point to 0.3 to 0.4 millimeters and with numerous, tiny glands occupied. The leaf blades are elliptical to inverted ovate, 2.5 to 3 millimeters long and 1.5 to 2 millimeters wide. The leaves are green at the base and dark red towards the end.
The bud, formed from stipules and covered with hairs, is broadly egg-shaped, fringed, 3.5 to 4.5 millimeters high and 3.5 to 4.5 millimeters in diameter. The individual stipule is 3.5 to 4 millimeters long and 3 to 4 millimeters wide, three-lobed, the middle lobe is divided into three sections, each with one to two slit leaves, the lateral lobes have five to six slit leaves on the inner edges.
The inflorescence axis is occupied with inflorescence 25 to 30 millimeters, without 15 to 20 millimeters long and with short-stalked glands. The inflorescence is a coil , the flower stalks are 2 to 3 millimeters long at flowering time, and up to 5 millimeters long on ripe fruits. The bracts are thread-like to narrow awl-shaped and covered with glandular hairs.
There are four to twelve flowers on the inflorescences . The 1.5 to 2.0 millimeters long and 0.7 to 1.0 millimeters wide sepals are egg-shaped. The wedge-shaped to inverted egg-shaped petals are white with a gray to reddish central rib, 2.2 to 2.5 millimeters long and 1.6 to 1.8 millimeters wide.
The anthers are yellow, pollen orange. The ovary is approximately round, 0.6 millimeters long and 0.7 millimeters in diameter. The three to four scars are kidney-shaped and white.
The brood scales formed in the center are broadly egg-shaped, two-lobed at the base, flattened at the end, 1 millimeter long, 0.7 millimeters wide and 0.4 millimeters thick.
Distribution, habitat and status
Drosera leucostigma grows around Cataby and southeast of Mogumber in Western Australia . It thrives there on sandy soils, associated with Drosera closterostigma , among others . The species is common and it is not assumed to be endangered.
Systematics
Drosera leucostigma 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 leucostigma is a dwarf sundew and as such belongs to the section Bryastrum in the subgenus Drosera .
proof
- 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 .
