Drosera rupicola
| Drosera rupicola | ||||||||||||
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Drosera rupicola , top view |
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| Scientific name | ||||||||||||
| Drosera rupicola | ||||||||||||
| ( NGMarchant ) Lowrie |
Drosera rupicola is a carnivorous plant of the genus sundew ( Drosera ). It wasfirst describedin 1982 by Neville Marchant as a subspecies of Drosera stolonifera , but Allen Lowrie classified it as a separate species in 2005. It belongs to the so-called "Tuberendrosera", a group of sundew, mostly from southwestern Western Australia , which forms tubers as persistence organs.
description
Vegetative characteristics
Drosera rupicola is a perennial , herbaceous plant that grows from a red, twisted tuber that is up to 3 centimeters long and 2 centimeters in diameter, around which brown, paper-like shells lie as remains from previous years. The underground runners reach 15 to 20 centimeters in length, above-ground runners up to 5 centimeters in length, under good conditions daughter tubers form on them. The plant as a whole is golden green, reddish or bronze colored.
The three to five unbranched stems up to 15 centimeters high stand half upright from a - occasionally missing - down-to-earth rosette.
The leaves of the rosette are stalked, the stem reaches a length of 2.5 to 11 millimeters, is flattened (1 to 3 millimeters) and broadened (1.5 to 5 millimeters). The leaf blades are inversely ovate, 3 to 9 millimeters long and 3 to 10 millimeters wide.
The leaves on the stem are arranged in three to four whorls per stem. They are petiolate, the stem reaches a length of 5 to 7 millimeters, is slightly folded in length, 0.5 to 2 millimeters thick and 1 to 3 millimeters wide. The shape of the leaf blades is very variable and ranges from transversely elliptical to flattened ovoid. It is 4 to 10 millimeters long and 5.5 to 15 millimeters wide. The upper side of all leaves is covered at the edge with somewhat longer, centrally shorter catching tentacles, the tentacles at the edges are movable and bend on trapped insects. Drosera rupicola is the only type of dissection that can move the blades.
Inflorescence and flowers
The one to four inflorescence axes carry simple grapes and arise from the rosette at the base, but occasionally also from the armpits on the lower part of the stem. The hairless, green flower stalks are 10 to 12 centimeters long and have 8 to 10 fragrant flowers that remain open until they are pollinated. The flower stalks are hairless, cylindrical, green and 6 to 17 millimeters long. The sepals are green, broadly ovate or elliptical and pointed and reach a length of 2.5 to 4 millimeters and a width of 1.5 to 2.5 millimeters, the margins are simple on the rear half, irregularly serrated or serrated towards the tip A few tiny sessile glands are distributed on the underside, otherwise they are smooth. The petals are inverted ovate, blunt and slightly notched at the tip. Their basic color is white, they are 9 to 10 millimeters long and 5 to 6 millimeters wide.
The five stamens are between 2.5 and 3 millimeters long and completely white, the pollen is yellow. The yellow ovary is approximately round, almost 1.5 millimeters long and has a diameter of around 2 millimeters in the flowering period. The three styluses are white and red at the base, they are a total of around 1.5 millimeters long and divided into many sections at the base, which are arranged almost whorled in the lower part. The scars form one to three bump-shaped growths at each tip.
fruit
The capsule fruit is broadly inverted ovoid with a diameter of 4.5 to 5 millimeters and contains around 28 gray-brown, irregular, but roughly rectangular to cylindrical shaped seeds that are 1 to 1.3 millimeters long and 0.8 to 1 millimeters wide and are provided with a reticulated, irregularly grooved surface.
Distribution, locations, endangerment
The species is native to southwestern Western Australia in the area between Pithara (240 km north of Perth ) and Hyden (approx. 350 km east of Perth, near Wave Rock ). The locations are all on granite and clay soils on granite that are wet in winter and completely dry in summer. The species is common in its range and is therefore not considered endangered.
Systematics
Drosera rupicola is part of the section Stoloniferae in the subgenus Ergaleium . The specific epithet means something like "rock dwellers" and refers to the locations of the species.
literature
- Allen Lowrie: A taxonomic revision of Drosera section Stolonifera (Droseraceae), from south-west Western Australia. In: Nuytsia . Vol. 15, No. 3, 2005, pp. 355-393 .
