Nepenthes treubiana

Nepenthes treubiana

Synonymy

Nepenthes treubiana Warb. in Engler, Bot. Jahrb. Syst. 13: 318. 1891 sec. Cheek & Jebb 2001
    • Unknown type category: New Guinea, McCluer Gulf, Sigar, 1889, O. Warburg 20581 (B).

Other sources

Jebb, M.H.P. & Cheek, M.R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106: 87
Boerlage, J. G. 1900: – Handl. 3(1): 54
Jebb, M.H.P. 1991: An account of Nepenthes in New Guinea. – Science in New Guinea 17: 7-54: 43, f. 25

Description

Terrestrial climber 6-9 m tall. Climbing stem terete 0.8-1.3 cm diam., sometimes ridged or winged, internodes c. 8 cm long, axillary buds not seen. Leaves chartaceous, petiolate, those of climbing stems lanceolate, elliptic or oblong, 30-39 by 7-12 cm; apex acute or rounded, sometimes peltate by < 1 mm, base attenuate or obtuse, petiole short, 7-15 by c. 1 cm, narrowly winged, these wings running down stem, to 0.3 cm broad, 5 cm long or petiole clasping stem by 1/3 its circumference and stem completely unwinged. Longitudinal nerves 3-7, some arising from midrib, running in outer 2/3 of blade, conspicuous. Pennate nerves numerous, oblique initially, then curving towards margin, reticulate in outer part of blade. Lower pitchers urceolate-globose, to 20 by 10 cm, fringed wings to 1.9 cm broad, fringe elements 0.3-0.5 cm long, dense; peristome rounded, to 1.5 cm wide, ribs 0.3-0.5 mm apart, outer margin entire, inner margin with teeth to 0.3 mm long, 1.5 mm long towards lid; lid orbicular, to 8 cm, apex rounded, base slightly cordate, lower surface lacking appendages, nectar glands dense throughout, thinly bordered or pit-like, shallow, orbicular, 0.2-0.4 mm diam.; spur simple. Upper pitchers infundibulate or broadly infundibulate, constricted at the mouth, (11-) 14-24 by 6-7.5(-9) cm, broadest 2/3 from base and then narrowing gradually to the mouth by 1.5-3 cm, rarely dilating at the mouth; wings in lower half 0.3-1 cm wide, unfringed, upper half with ridges, or the whole pitcher with ridges only; mouth subelliptic, almost horizontal, slightly or highly concave, the rear half rising to form a column; peristome rounded, 4-12 mm wide, ends at lid folding outwards forming two obtuse angles c. 2 cm long, ribs 0.5 mm apart, 0.3 mm high, conspicuous, outer edge entire, inner with teeth 0.5 mm long, decreasing to 0.3 mm long near lid; lid suborbicular(-elliptic), 5-6.3 by 5.2-6.5 cm, apex rounded to slightly retuse, base shallowly cordate to rounded, lower surface lacking appendages, glossy, nectar glands scattered over whole surface or absent from the central area, orbicular, pit-like, 0.2 mm diam.; spur filiform, c. 9 mm long, entire or shortly bifid. Male inflorescence c. 40 by c. 5 cm; peduncle c. 11 cm long, 0.7 cm diam. at base; partial peduncles c. 80, 1- or 2-flowered, 0.5-0.7(-2.5) cm long, bracts inserted along length; bracts filiform, patent, 1-2 mm long; pedicels 14-22 mm long; tepals 5-6 by 3-3.5 mm; androphore 3.5-5 mm long; anther head 1.5 by 1.5 mm. Fruit with stipe 2-3 mm long; valves 18-19 by 3.5 mm. Seed fusiform, 7-9 mm long. Indumentum generally sparse, simple on leaf margins and tendrils, stellate on pitcher surface and leaf underside, 0.15-0.3 mm wide, especially dense beneath blade margin; inflorescence brown puberulous with stellate hairs 0.1-0.2 mm diam. Colour of pitchers and flowers not known.A

Notes

Nepenthes treubiana is unlikely to be confused with any other lowland species of Nepenthes in the island of New Guinea (N. ampullaria, N. insignis, N. mirabilis, N. neoguineensis, and N. papuana). None of these species has the combination of markedly petiolate, large leaf blades (30-39 by 7-12 cm) conspicuously stellate hairy below and strongly infundibuliform upper pitchers. Nepenthes treubiana is similar to and was formerly united with N. sumatrana from Sumatra. Nepenthes treubiana differs by having teeth on the inner margin of the peristome (vs. peristome entire), the densely hairy leaf margin, and relatively uniform lid glands, 0.2-0.4 mm diam. (vs. 0.2-0.7 mm diam. in N. sumatrana), evenly spread throughout the lid surface or absent from the centre (vs. largest along the midline and smaller elsewhere). Nepenthes treubiana is also similar to N. rafflesiana of Borneo, Sumatra and Peninsular Malaysia, but differs in lacking the characteristic long white arachnoid hairs of that species.A

Distribution (General)

W New Guinea: Sorong, Misool IslandsA

Habitat

Margin of Agathis or coastal forest; 0-500 m.A

Bibliography

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

Images

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
1889-��-��Warburg, O. 20581B
Citation: New Guinea, McCluer Gulf, Sigar, 1889, O. Warburg 20581.

Specimen summary: B
Unknown type category of Nepenthes treubiana Warb.