Nepenthes dubia
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Nepenthes dubia |
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Nepenthes dubia is a carnivorous plant from the genus of pitcher plants ( Nepenthes ). It is native to Sumatra .
description
Nepenthes dubia is a perennial, evergreen , climbing, only slightly hairy subshrub . The slender stem axis is cylindrical to slightly angular and 3 to 4 millimeters thick, the distance between the nodes is 3 to 10 centimeters. On her stand the sessile, lanceolate-spatulate, pointed leaves in a distributed arrangement, they are usually 6 to 10 centimeters long and 1.2 to 1.8 centimeters wide, thin, but leathery. At the base they are wedge-shaped and encompass the stem between a third and a half. The veins are indistinct, in the lower third of the leaf arise three parallel ribs on each side of the central rib, which reach the edge of the leaf at the tip of the leaf. The side ribs are inclined and are irregularly networked.
The tendril is once or twice as long as the leaf, if it merges into a pot, it can have a curl. The upper pitchers emerge from the hanging end of the tendrils after a 5 to 10 millimeter wide loop. They are tubular to slightly thickened in the lower part and 0.8 to 1 centimeter wide, in the upper part trumpet-shaped, at the top 2 to 3 centimeters wide, the two wing strips are inconspicuous. The almost completely flat jug opening is egg-shaped, tapering towards the base of the lid. The peristome is flattened, rolled up on the outer edge, simple on the inner edge, up to 4 millimeters wide at the front and up to 2 millimeters wide at the lid. The ribs are 0.5 to 0.25 millimeters apart. The inner walls of the jugs have around 600 to 900 small, only slightly or completely undeveloped glands per square centimeter.
The lid is narrowly wedge-shaped, up to 4 inches long and 0.7 inches wide. At the extreme end it is rounded, towards the base it tapers, on the underside there are numerous round or elliptical glands. The thread-like spur is 3 to 5 millimeters long and attaches close to the lid.
The female inflorescences are grapes . The inflorescence shaft is around 7 centimeters long, a single, 1 to 2 millimeter long bract is found slightly above its center . The flower stalks are up to 6 millimeters long.
distribution
Nepenthes dubia is only native to the Gunung Talamau table mountain in central Sumatra in the province of Barat (West Sumatra), where it can be found at altitudes between 1900 and 2500 meters.
Systematics
Nepenthes dubia was first described by Benedictus Hubertus Danser in 1928 . Cornelis Andries Backer had already considered describing the plant as "Nepenthes linguifer". The specific epithet “dubia” testifies to Danser's uncertainty regarding the species rank of the plant, “dubius” means “uncertain, doubtful” and is usually only used for taxa whose exact rank is unclear. Danser wrote: "Perhaps N. dubia is a hybrid of N. inermis and another species [..]". The corresponding uncertainty continues to the present day, Jebb and Cheek walk as Danser into account that it is a hybrid of Nepenthes inermis and Nepenthes bongso could act
In 1995, Andreas Wistuba and Joachim Nerz described Nepenthes tenuis from an altitude of around 1000 meters. Jebb and Cheek see this as synonymous with Nepenthes dubia , which would significantly increase the distribution area.
Individual evidence
- ↑ a b c Benedictus H. Danser : The Nepenthaceae of the Netherlands Indies. = Contributions à l'étude de la flores des Indes Néerlandaises. XV. In: Bulletin de Jardin de Botanique. Series 3, Vol. 9, No. 3-4, 1928, ISSN 0852-8756 , pp. 249-438, ( N. dubia -Text online ).
- ^ A b c d Matthew Jebb, Martin Cheek: A Skeletal Revision of Nepenthes (Nepenthaceae). In: Blumea. Vol. 42, 1997, ISSN 0006-5196 , pp. 1–106, here pp. 36–37, ( digital version (PDF; 8.82 MB) ).
- ↑ Helmut Genaust: Etymological dictionary of botanical plant names. 3rd, completely revised and expanded edition. Birkhäuser, Basel et al. 1996, ISBN 3-7643-2390-6 .
- ^ "Perhaps N. dubia is a hybrid of N. inermis and another species [...]" (Danser 1928)
- ^ Andreas Wistuba , Joachim Nerz : Five new taxa of Nepenthes (Nepenthaceae) from North and West Sumatra. In: Carnivorous Plant Newsletter. Vol. 23, No. 4, 1994, ISSN 0190-9215 , pp. 101-114, here p. 104, ( online ).
