Drosera omissa
| Drosera omissa | ||||||||||||
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Flower of Drosera omissa |
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| Scientific name | ||||||||||||
| Drosera omissa | ||||||||||||
| Diels |
Drosera omissa is a carnivorous species of the sundew genus. It belongs to the dwarf sundew and wasfirst describedin 1906 by Ludwig Diels .
description
Drosera omissa is a small, perennial, herbaceous plant with fine, fibrous roots. The rosette-shaped growing species reaches a diameter of 15 to 30 millimeters and a height of two to five millimeters.
The bud, formed from stipules and covered with hairs, is egg-shaped, fringed, 3 to 3.5 millimeters high and 2.5 to 3 millimeters in diameter. The individual stipule is 4 to 5 millimeters long and 3 to 4 millimeters wide, three-lobed, the middle lobe is divided into three sections, the middle with three slit leaves, the lateral lobes have four to five slit leaves on the inner edges.
The leaf blades are inversely ovate, 3.5 to 4 millimeters long and 1.5 to 2 millimeters wide. At the base the leaves are green, towards the end they become bronze or they are completely red or bronze. The petioles are approximately linear, slightly tapering, strongly flattened triangular in cross-section, 4 to 6 millimeters long, 0.4 to 0.8 millimeters wide, tapering to 0.3 to 0.6 millimeters at the extreme point and with numerous, occupied by tiny glands.
The inflorescence axis is 25 to 45 millimeters long with inflorescence , without 20 to 25 millimeters and sparsely occupied with stalked glands. The inflorescence is a coil , the flower stalks are 2.5 to 3 millimeters long and do not lengthen as the fruit ripens. The bracts are ahlen- open until thready and with glandular hairs. There are six to twelve flowers on the inflorescences . The 2.0 to 2.3 millimeters long and 0.8 to 1.3 millimeters wide sepals are "narrow ovoid" to ovoid. The inverted egg-shaped to wedge-shaped petals are pink to white with a gray central rib and green base, 4 to 6 millimeters long and 3.5 to 6.5 millimeters wide.
The anthers are light yellow, pollen yellow. The ovary is wide reverse-ovoid, 0.7 millimeters long and 0.8 to 0.9 millimeters in diameter. The three to four stigmas are disc-shaped and light green to yellow.
The brood scales formed in the center are "broadly ovoid", unilobed at the base, flattened at the end, one millimeter long, 0.9 millimeters wide and 0.6 millimeters thick.
Distribution, habitat and status
Drosera omissa grows in southwestern Western Australia in a large area from the west coast ( Kalbarri , Perth ) to the Wheatbelt . It thrives there on sandy and laterite soils .
The species is common and it is not assumed to be endangered.
Systematics
Drosera omissa was first described by Ludwig Diels in 1906 , is a dwarf sundew and as such belongs to the section Bryastrum in the subgenus Drosera . As part of his work on the section, Allen Lowrie and Neville Marchant classified the species as a subspecies of Drosera nitidula in 1992 . A species Drosera ericksoniae , which he described at the same time , turned out to be identical to the holotype of Diels' Drosera omissa during a revision of the Drosera nitidula complex in 2007 and was therefore classified as a synonym. The plant classified by Lowrie and Marchant as a subspecies of Drosera nitidula was not identical to Diels Drosera omissa and was therefore newly described as Drosera patens .
Some hybrids also exist in nature :
- Drosera omissa x occidentalis . These plants grow on the edge of Lake Badgerup and Lake Jandabup in the Wanneroo area .
- Drosera omissa x pulchella . These plants also grow in the Wanneroo area and are sterile. The existing colonies only multiplied from brood scales.
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 .
