Nepenthes pectinata

Nepenthes pectinata

Synonymy

Nepenthes pectinata Danser in Bull. Jard. Bot. Buitenzorg, sér. 3, 9: 350, f. 17a, b, d. 1928 sec. Cheek & Jebb 20011
    • Isotype: Sumatra, Sumatera Barat, G. Talakmau, alt. 1850 m, 13 May 1917, Bünnemeijer 700 (BO).
    • Lectotype (designated by Schlauer, J. & Nerz, J. 19942): Sumatra, Sumatera Barat, G. Talakmau, alt. 1850 m, 13 May 1917, Bünnemeijer 700 (L).
  • 1. partim, 2. Schlauer, J. & Nerz, J. 1994: – Blumea 39: 139-142
  • =Nepenthes melamphora var. tomentella Becc., Malesia 3: 13. 1886 syn. sec. Cheek & Jebb 2001
    • Unknown type category: Sumatra, Sumatera Barat, Mt Singgalang, Jun–Jul 1878, O. Beccari 48 (K).
    • Unknown type category: Sumatra, Sumatera Barat, Mt Singgalang, Jun–Jul 1878, O. Beccari 48 (L).
  • =Nepenthes xiphioides Salmon & Maulder in Carniv. Pl. Newslett. 24: 78, f. 1 & 2. 1995 syn. sec. Cheek & Jebb 2001
    • Unknown type category: Sumatra, Sumatera Utara, G. Pangulubao, alt. 1900 m, 17 Feb 1995, B. Salmon & R. Maulder 221720 (AK).
  • Nepenthes rosulata Tamin & M. Hotta, Tamin & M. Hotta - in M.Hotta, Divers. & Dynam. Pl. Life Sumatra. 1986: 95, f. 4, nom. nud., syn. sec. Cheek & Jebb 2001

Other sources

Jebb, M.H.P. & Cheek, M.R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106: 71

Description

Terrestrial climber to 4 m tall. Stems terete to 1 cm diam. Leaves thinly coriaceous, more or less sessile; those of climbing stems elliptic-spathulate to oblong, 15-27 by 3-6 cm, apex acute to acuminate, base cuneate or broadly winged, clasping the stem and decurrent for 1-3 cm. Longitudinal nerves 3 or 4 on each side of the midrib, scattered throughout lamina, innermost arising from midrib. Pennate nerves numerous, arising obtusely and forming a net-like pattern with the longitudinal nerves. (Leaves of ro-settes usually highly reduced, sometimes as small as 3 by 0.7 cm, triangular in outline, dilated at the base, and clasping the stem, sometimes forming a sheath, with penninervous venation only, only the largest ones with the beginning of longitudinal veins).
Lower pitchers ellipsoid-urceolate, narrowing towards mouth, 6-16 by 2-6.5 cm, with 2 fringed wings 2-5 mm wide, fringe elements 2-4 mm long; mouth ovate, acute to acuminate towards lid, slightly concave, oblique; peristome rounded at front, expanded towards sides and narrowing towards lid, 2-12 mm wide, with prominent, papery, thin ribs 0.8-2 mm apart, 0.5-1.5 mm high, outer edge entire, inner with teeth 2-4 mm long; lid ovate 2-7.3 by 1.5-5.3 cm, apex rounded, base truncate to cordate, lower surface lacking appendages, nectar glands few, prominently lipped, 0.1-0.5 mm wide, near midline and towards base of lid only, absent from margin; spur filiform or flattened, rarely many branched, 1-4 mm long.
Upper pitchers apparently only produced rarely, or (?) only in some populations (e.g. G. Malintang), somewhat ventricose in lower half, tubular above; 7-22 by 1.5-4.5 cm, with two fringed wings to 0.5 cm wide, fringe ele-ments to 0.6 cm long; peristome expanded towards lid, to 2.5 cm wide, outer edge entire, inner with teeth to 1 cm long; lid broadly ovate, lower surface lacking appendages, nectar glands numerous near midline, largest in centre of lid, to 0.8 mm wide.
Male inflorescence similar to that of N. gymnamphora to 50 cm long; partial peduncles 2-flowered near base, 1-flowered above, with a filiform bract near base, rarely wholly 1-flowered, to 0.5 mm long; pedicels to 1.5 mm long; tepals to 5 by 2.5 mm; androphore to 5 mm long; anther head to 1.5 mm wide.
Indumentum densely brown tomentose on young pitchers, hairs stellate, c. 0.1 mm wide; leaf margin often with dense brown indumentum on lower surface; inflorescence axis and pedicels densely pubescent. Colour of lower pitchers green, densely blotched with maroon.A

Notes

Nepenthes pectinata is very closely related to the Javanese N. gymnamphora. They differ in that the leaves of N. pectinata are more gradually attenuate to the base, and decurrent down the stem, the margin of the blade is usually densely pubescent below, and the whole plant is generally more tomentose. The peristome teeth of the lower pitchers of N. pectinata are longer than those of N. gymnamphora. Upper pitchers are not often produced, whereas they are regularly found in N. gymnamphora. Nepenthes pectinata can be distinguished from N. bongso and N. singalana by its large upper leaf blades which are decurrent down the stem; from N. bongso it is further distinguished by its long peristome teeth and because its upper pitchers, when produced, are subcylindrical, not infundibulate.
Authors prior to Danser usually treated the Sumatran N. pectinata only as a variety of the Javanese N. gymnamphora. Danser described N. pectinata from mixed material based on N. pectinata and N. singalana. Schlauer & Nerz Blumea 39 (1994) 139-142 were the first authors to recognise this and lectotypified with a specimen of N. pectinata (which they recognised as N. gymnamphora). Tamin & M. Hotta in Diversity & Dynamics of Plant Life in Sumatra (1986) did not recognise the presence of N. pectinata (or N. gymnamphora) in Sumatra, referring the majority of collections to N. singalana, and establishing the invalid name N. rosulata for specimens of N. pectinata from G. Gadut and G. Talang.A

Distribution (General)

C Sumatra.A

Habitat

Undisturbed dense forest, hill dipterocarp forest or wet mossy forest on ridge tops; 950-2750 m.A

Bibliography

A. Cheek, M.R. & Jebb, M.H.P. 2001: Flora Malesiana - Nepenthaceae, Series I, Volume 15

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
1917-05-13Bünnemeijer 700BO, L
Citation: Sumatra, Sumatera Barat, G. Talakmau, alt. 1850 m, 13 May 1917, Bünnemeijer 700.

Specimen summary: BO
Isotype of Nepenthes pectinata Danser

Specimen summary: L
Lectotype of Nepenthes pectinata Danser

1878-06-��Beccari, O. 48K, L
Citation: Sumatra, Sumatera Barat, Mt Singgalang, Jun–Jul 1878, O. Beccari 48.

Specimen summary: K
Unknown type category of Nepenthes melamphora var. tomentella Becc.

Specimen summary: L
Unknown type category of Nepenthes melamphora var. tomentella Becc.

1995-02-17Salmon, B.R. & Maulder, R. 221720AK
Citation: Sumatra, Sumatera Utara, G. Pangulubao, alt. 1900 m, 17 Feb 1995, B. Salmon & R. Maulder 221720.

Specimen summary: AK
Unknown type category of Nepenthes xiphioides Salmon & Maulder