Nepenthes mapuluensis

Nepenthes mapuluensis


Nepenthes mapuluensis J.H.Adam & Wilcock in Blumea 35(1): 265. 1990 sec. Cheek & Jebb 2001
    • Isotype: Borneo, E Kalimantan, Berouw, Mt Ilas Mapulu, alt. 800 m, 23 Sep 1957, Kostermans 14017 (BO)
    • Isotype: Borneo, E Kalimantan, Berouw, Mt Ilas Mapulu, alt. 800 m, 23 Sep 1957, Kostermans 14017 (K)
    • Isotype: Borneo, E Kalimantan, Berouw, Mt Ilas Mapulu, alt. 800 m, 23 Sep 1957, Kostermans 14017 (L)
    • Lectotype: Borneo, E Kalimantan, Berouw, Mt Ilas Mapulu, alt. 800 m, 23 Sep 1957, Kostermans 14017 (L)

Other sources

Clarke, C. M. 1997: Nepenthes of Borneo. – Kota Kinabalu: Natural History Publications: 104, f. 69
Jebb, M. H. P. & Cheek, M. R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106: 59


Terrestrial shrub to at least 20 cm tall, possibly climbing. Stem terete, strongly flexuose, 5 mm diam., internodes of climbing stems 2.5-4 cm long, axillary buds hemispherical, 1 by 1 mm, inserted about 1 mm above the axil. Leaves coriaceous, subsessile, lanceolate-obovate 13-26 by 2-5.5 cm, apex acute to rounded, peltate, base attenuate, parallel sided and somewhat dilated and amplexicaul at the very base, clasping the stem for c. 1/2 its circumference. Longitudinal nerves 4 or 5 on each side of the midrib, in outer 2/3-3/4 of blade, arising from base, or some from lower part of midrib. Pennate nerves arising obliquely, curving towards margin. Lower pitchers ellipsoid throughout, and narrowest at mouth, or somewhat tubular in upper 1/2; 12-22 by 3.5-8 cm, fringed wings 2-8 mm broad, with fringe elements c. 3 mm long, 2-4 mm apart; mouth oblique, elliptic, straight; peristome rounded at front, somewhat broadened near rear, 3-22 mm wide, ribs 0.6-0.7 mm apart, 0.3 mm high, outer edge undulate, inner with teeth to 1.5 mm long; lid ovate to narrowly ovate, 4.5-9.2 by 3-5 cm, apex rounded, base abruptly attenuate to scarcely cordate, lower surface lacking appendages, with a prominent central ridge 1-2 mm high, nectar glands dense near base and along midline, obscurely rimmed, pit-like, longitudinally elliptic, 0.3 mm long, remaining surface glandless apart from a few orbicular glands 0.1-0.2 mm diam. near the midline; spur flattened, c. 10 by 1 mm, apex rounded. Upper pitchers ellipsoid in lower 1/2, constricted above and widening to mouth; to 19 by 5 cm; mouth ovate; peristome 4 mm wide, rounded at front, expanded near lid to 12 mm wide, ribs 0.3-0.5 mm apart, outer edge sinuate, inner with teeth to 2 mm long; wings fringed as in lower pitcher, but near mouth only. (Upper pitchers of Kostermans 14017, BO specimen ellipsoid below, tubular in upper 1/2; to 12 by 2 cm; peristome 1-2 mm wide, rounded, not expanded; wings absent). Male inflorescence 15-20 by c. 2.5 cm; peduncle 7.5 cm long, 1.5-2 mm diam. at base; partial peduncles 1-flowered; bracts absent; pedicels 6-7 mm long; tepals elliptic, c. 3 by 2.25 mm; androphore 2.25 mm long; anther head 1 by 1.25 mm. Indumentum densely puberulent of simple, patent hairs 0.1-0.2 mm long, present on stems and upper leaf surfaces (hairs brownish white) and on inflorescence (hairs red) from base of peduncle to lower surface of tepals; androphore glabrous; lower surface of leaves with sessile red glands c. 0.1 mm diam. Colour: leaves drying a characteristic grey-green above, and reddish brown below. Live pitchers pale green to white with black-purple specks to dark purple with greenish purple spots; peristome brown; wings brown.A


This species has a striking similarity to N. northiana: the reclined ellipsoid lower pitchers with a large oblique mouth, the expanded peristome with an undulate outer edge, the large vaulted narrowly ovate lid and the peltate leaf tips. However, these similarities may be purely superficial. Nepenthes mapuluenis differs particularly in the slender, terete, strongly flexuose, puberulent stems, smaller, puberulent leaves, auriculate, non-decurrent leaf base, pitcher lid with keeled midline bearing numerous longitudinally elliptic nectar glands, nectar glands otherwise absent, diminutive inflorescence with 1-flowered partial peduncles and pedicels comparatively truncated. The upper pitchers of N. mapuluensis are so incompletely known that a full comparison with those of N. northiana cannot be made at this stage. Like N. northiana, N. mapuluensis is only known from limestone. One collection comes from the type locality of N. campanulata.
The majority of the isotype material at Bogor exhibits very different upper pitchers from the remaining material, but the leaves match the remaining specimens, and we may presume that the species either shows an extreme dimorphy in shape of the upper pitchers, or that that material is a mixed collection with an unknown species.
In the protologue, J.H. Adam & Wilcock only cited the holotype and so apparently based their description on this alone. Two other collections at Leiden and Bogor (Kostermans 13821 and Geesink 9314) allow us to make the more complete description of N. mapuluensis above. The description in the protologue does not entirely match the specimen that it is based on, for example, the specimen concerned does not have angular or glabrous stems, nor do the other specimens of this species that we have examined. We have modified the description above accordingly.A

Distribution (General)

Borneo: E Kalimantan (Sambaliung Range).A


Limestone; 700-800 m.A


A. Cheek, M. R. & Jebb, M. H. P. 2001: Flora Malesiana - Nepenthaceae, Series I, Volume 15. – Leiden: Nationaal Herbarium Nederland, Universiteit Leiden branch



CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
1957-09-23Kostermans 14017BO, K, L(2)
Citation: Borneo, E Kalimantan, Berouw, Mt Ilas Mapulu, alt. 800 m, 23 Sep 1957, Kostermans 14017

Specimen summary: BO
Isotype of Nepenthes mapuluensis J.H.Adam & Wilcock

Specimen summary: K
Isotype of Nepenthes mapuluensis J.H.Adam & Wilcock

Specimen summary: L
Isotype of Nepenthes mapuluensis J.H.Adam & Wilcock