Nepenthes dubia
Nepenthes dubia
Nepenthes dubia is a carnivorous plant in the genus of pitcher plants ( Nepenthes ). It is native to Sumatra.
Description
Nepenthes dubia is a perennial, evergreen, climbing, only slightly hairy shrub. The slender stem axis is cylindrical to slightly edgy and 3 to 4 millimeters thick, the distance between the nodes is 3 to 10 inches. At her sessile, lanceolate - spateligen, pointed leaves stand 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 running to wedge-shaped and include the stem between a third and a half. The venation is indistinct, in the lower third of the leaf spring from the midrib to each side three parallel ridges that reach the leaf edge at the blade tip. The side ribs are oblique and irregularly cross-linked.
The vine is one to two times as long as the sheet so it goes into a pot, it may have a squiggle. The upper pitchers go from the hanging end of the tendril is a 5 to 10 millimeters wide loop out. They are tubular to slightly thickened in the lower part and from 0.8 to 1 inches wide, at the top of trumpet-shaped, at the top 2 to 3 inches wide, the two wing strips are inconspicuous. The almost completely flat pot opening is ovoid, tapering to the lid approach to himself. The peristome is flattened, rolled up at the outer edge, the inner edge simply forward up to 4 millimeters wide with the lid up to 2 millimeters wide. The ribs are to each other at distances from 0.5 to 0.25 millimeters. The inner walls of the cans have per square centimeter to about 600 to 900 small, weak or entirely unvertiefte glands.
The cover is narrow in a wedge shape, of up to 4 inches long and 0.7 inches wide. At the far end, it is rounded to the approach towards it tapers at the bottom, there are numerous round or elliptical glands. The filiform spur is 3 to 5 millimeters long and is close to the lid.
The female inflorescences are grapes. The inflorescence stem is approximately 7 inches long, slightly above its center there is a single, 1 to 2 mm long bract. The flower stems are up to 6 millimeters long.
Dissemination
Nepenthes dubia is native only to the Table Mountain in central Sumatra Gunung Talamau in the province Barat ( West Sumatra ), where it is found at altitudes 1900-2500 meters.
System
Nepenthes dubia was first described in 1928 by Benedictus Hubertus Danser. Previously Andries Cornelis Backer had taken into account to describe the plant as " Nepenthes linguifer ". The epithet " dubia " testifies Dansers uncertainty about the Artrangs the plant, " dubius " means " uncertain, doubtful," and is used usually only for taxa whose exact rank is unclear. Danser wrote: "Maybe N. dubia is a hybrid of N. inermis and a different kind [ ..] ". The corresponding uncertainty continues to the present day, Jebb and Cheek walk as Danser into consideration that it could be a hybrid of Nepenthes inermis Nepenthes and bongso
Andreas Wistuba and Joachim Mink described in 1995 Nepenthes tenuis from an altitude of 1000 meters. Jebb and Cheek see this as a synonym for Nepenthes dubia, causing the distribution area would significantly increase.