Nepenthes malimumuensis

Nepenthes malimumuensis

Synonymy

Nepenthes malimumuensis Lagunday, Acma, Cabana, Sabas & V.B.Amoroso in Philippine J. Sci. 146(2): 160 (-161, fig. 1-2). 2017 sec. Lagunday & al. 2017
    • Type (designated by Lagunday, N. E., Acma, F. M., Cabana, V. G., Sabas, N. M. & Amoroso, V.B. 20171): Philippines, Mindanao, Pantaron range, Bukidnon, Municipality of San Fernando, Mt. Malimumu (1,016 m a.s.l.), 09.02.2014, N.E Lagunday, M. Acopio, H. C. Armecin, A. Calaguian and N.M. Sabas, holotype 00009841, Central Mindanao University Herbarium (CMUH), Musuan, Bukidnon, Philippines
  • 1. Lagunday, N. E., Acma, F. M., Cabana, V. G., Sabas, N. M. & Amoroso, V.B. 2017: Two new Nepenthes species from the unexplored mountains of Central Mindanao, Philippines. – Philippine Journal of Science 146(2): 159-165

Description

A terrestrial climbing vine. Stems up to 3 m long, glabrous, terete to triangular in transection, 1 to 1.5 cm in diameter; internodes are up to 5.8 cm in length. Leaves have winged petioles that are up to 8 cm long and 3 cm wide. They are broadly spathulate to ovate, rounded leaf apex and attenuate base. They are up to 54.5 cm long and 11.2 cm wide and with four or occasionally five nerves running on either side of the midrib.
Lower pitchers are wholly cylindrical or slightly swollen in the bottom and slightly funnel-shaped towards the opening. They are up to 38 cm long and 11 cm wide in the upper half. Wings with sinuate margin run down in front of the trap up to 2/3 of the pitcher anterior and continue basally as a ridge, fringed with filaments up to 1.2 cm long. The pitcher opening is ovate acuminating towards the lid. The peristome has teeth-like projections that are short and triangular with proximally sunken nectar glands in the semilunar depressions between the ribs with canals emptying into the inner pitcher wall. They are slightly flattened, tapering posteriorly forming a distinct vertically oriented neck, 4.4 to 5.5 cm wide, up to 2 mm space between ribs. Lids are ovate, up to 12 cm long and 10 cm wide. The lid appendage is reduced to a keel. The lid nectar glands are round to ovate large and smaller glands evenly distributed. The lid spur is filiform, pubescent and occasionally branched, 1.7 to 2 cm long and up to 1 mm in diameter. Tendrils are non-coiling, up to 40 cm long and 5 mm in diameter. The exterior of lower pitchers is olive drab green with blotches of garnet red or suffused with ruby red with a yellow green bottom depending on sunlight exposure. The interior of the pitcher is olive drab green with blotches of garnet red or entirely suffused with mahogany red.
Upper pitchers are funnel-shaped in the bottom third and tapers posteriorly towards the tendril becoming cylindrical above then slightly funnel-shaped towards the ovate opening, up to 37 cm long and 10.5 cm wide near the peristome; wings are reduced to ridges. The peristome morphology is consistent with the lower pitchers. The lid spur is filiform and unbranched, 1 to 2 cm long and up to 1 mm in diameter. The tendrils are coiling to non-coiling, up to 58 cm long and 5 mm in diameter. The nectar gland distribution, coloration and indumentum are consistent with the lower pitchers.
The male inflorescence observed in the type locality during the sampling was juvenile and was neither collected nor described in this paper.
The female inflorescence is a panicle composed of a 39 cm long scape up to 1 cm in diameter and an additional of up to 65 cm rachis. The partial peduncles are two- flowered and 12 mm long. The pedicels are up to 3.5 cm long and 1 mm in diameter bearing tetramerous narrow ovate petals that are up to 6 mm long and 2 mm wide with huge round to elongated nectar glands in the upper surface. The capsule bearing the seeds is 3 cm long and 5 mm wide. The seeds have filiform extensions and are up to 1.4 cm long and 1 mm wide.
The pitchers are composed of the digestive zone in the bottom and a waxy zone towards the opening.
The indumentum is a multicellular trichome with short pseudo-branches arising from the basal cell, glandular to non-glandular present in the tendril, pitcher exterior and inflorescence.A

Conservation

Classified as Critically Endangered [CR B1ab (i)]; extent of occurrence estimated to be less than 10 km².A

Etymology

The specific epithet denotes that N. malimumuensis was discovered from Mt. Malimumu.A

Habitat

Strictly terrestrial in a narrow altitude range at 1,000-1,020 m a.s.l. along the ultramafic ridge trails of Mt. Malimumu, in mixed dipterocarp forest mostly covered with gravel and rocks.A

Bibliography

A. Lagunday, N. E., Acma, F. M., Cabana, V. G., Sabas, N. M. & Amoroso, V.B. 2017: Two new Nepenthes species from the unexplored mountains of Central Mindanao, Philippines. – Philippine Journal of Science 146(2): 159-165

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Philippines
Citation: Philippines.

Specimen summary: Philippines, Mindanao, Pantaron range, Bukidnon, Municipality of San Fernando, Mt. Malimumu (1,016 m a.s.l.), 09.02.2014, N.E Lagunday, M. Acopio, H. C. Armecin, A. Calaguian and N.M. Sabas, holotype 00009841, Central Mindanao University Herbarium (CMUH), Musuan, Bukidnon, Philippines
Type for: Nepenthes malimumuensis Lagunday, Acma, Cabana, Sabas & V.B.Amoroso