Drosera stolonifera
Drosera stolonifera
Drosera stolonifera is a carnivorous plant from the family of sundew plants ( Droseraceae ). The occurring in the southwestern Western Australia species belongs to the so-called " Knollendrosera ", a group of Sonnentauen forming tubers as outlasting.
Description
Drosera stolonifera is a perennial, herbaceous plant that grows from a red, kidney-shaped, up to 10 millimeters long and 15 millimeters wide tuber to the brown as remnants of previous years, papery cases are. The underground runners reach 15 centimeters in length, above-ground, resting on the substrate foothills rarely missing, are 1 to 1.5 mm thick and up to 10 inches long, in good conditions develop at their daughter tubers. The two or three, rarely more unbranched, 10 to 15 centimeters tall stalks are semi-erect from a basal rosette. All the leaves, petioles, stems, and flower stems are covered with tiny glands.
The plant has three different leaf shapes, two of them in the rosette, one on the stems. The tops of all leaf blades is busy at the edge with a little longer, shorter muzzle centered tentacles. The rosette is foliated sparse. Your lower leaves are stalked, the stalk reaches a length of 4.5 to 5 mm, is flattened (1.5 to 2 mm) and wider (2.5 to 3 millimeters ). The leaf blades are wedge-shaped, 4-5 mm long and 1.5 to 2 millimeters wide. The spreading of the upper leaves of the rosette are transverse elliptic, 3-4 mm long and 5.5 to 7 millimeters wide. The leaves on the stem are arranged in whorls of three to four per stem and are available towards the tip increasingly upright, so that there is a conical habit. They are stalks, the handle reaches a length 5 to 10 mm, has on top a longitudinal groove, and is 1 to 1.6 mm wide. The leaf blades are kidney-shaped, 2.5 to 3.5 mm long and 4 to 5.5 millimeters wide.
Bloom time is from September to October. The inflorescence axes carry two -to three- fold umbrella- branched and arise from the rosette at the base, but occasionally in small and wenigblütigerer form the leaf axils on the upper part of the stem axis. The main raceme is 15 to 20 inches long and transmits 12 to 20 flowers. The pedicels are 7-12 mm long. The sepals are ovate and pointed, black polka dots and reach a length of 3.5 to 5 millimeters and a width of 1.7 to 3 millimeters. The petals are obovate and slightly notched at the tip. Its basic color is white, they are 7.5 to 8 mm long and 4-5 mm wide. The five stamens are 3-4 mm long, the filament is white, anthers and pollen yellow. The green ovary is nearly round, nearly 1 millimeter long and has in the heyday of a diameter of about 1.3 millimeters. The three pens are white, about 1.5 mm long and divided into many sections that are partially located wirtelförmig and partially upright in the center of the whorl. The scars are easily formed at the end of the pen.
The fruit capsule is 1.5 mm long with a diameter of 2 millimeters and contains approximately twelve black, cup -like shaped seeds 0.5 to 0.6 mm long, 0.4 to 0.5 millimeters wide and with reticulate, irregularly grooved surface are provided.
Dissemination, locations, hazard
The species is native to southwestern Western Australia in marshy heathland south of Perth until after Pinjarra. The locations are all astonished wet, peaty and sandy, it occurs associated with tea trees ( Melaleuca ) on occasional bush fires lead to mass flowers. In their area of distribution, the species is often, therefore it is considered safely.
Systematics and history of research
The type specimens were collected in 1833 by Carl from hill on the Swan River and first described in 1837 by Stephan Friedrich Ladislaus finite. The specific epithet means as much as " suckering " and refers to the ability of the species to form just such.
Drosera stolonifera is part of section Stoloniferae in the subgenus Ergaleium whose type species it is. Closely related is Drosera stolonifera with Drosera purpurascens.
Since Ludwig Diels in 1906 with the inclusion of Drosera humilis aufstellte as a subspecies of the first Untertaxon, numerous other varieties and subspecies have been established. After many of these new taxa, especially in the 1980s and 1990s, Allen Lowrie revised and NG Marchant in 2005 and collected all the complex Untertaxa to species rank. Through a formal error ( Lowrie and Marchant forgot the required by Article 33.4 of the ICBN page stating the Basionyms ) is the recombination Drosera monticola, however invalid, and has since then not even grudge, so that in addition to the Nominatunterart still
- Drosera stolonifera subsp. monticola
Exists as Untertaxon.
Within the nominate form can be prepared by Lowrie distinguished two forms not formally described, namely one from the marshland and one from the hill country, the latter is the older the foliage significantly redder.