Nepenthes pilosa

Nepenthes pilosa

Synonymy

Nepenthes pilosa Danser in Bull. Jard. Bot. Buitenzorg, sér. 3, 9: 355, f. 19. 1928 sec. Cheek & Jebb 2001 wfo-0000381452
      Holotype: Borneo, E Kalimantan, G. Lesung, 28 Jan 1899, Amdjah 491 (BO); Epitype: Borneo, Sarawak, Bt Lawi, Bario, alt. 1630 m, 24 Aug 1995, Awa & Lee S 50980 (K designated by Cheek & Jebb 20011; isoepitypes: KEP, L, SAR)
  • 1. Cheek, M. R. & Jebb, M. H. P. 2001: Flora Malesiana - Nepenthaceae, Series I, Volume 15. – Leiden: Nationaal Herbarium Nederland, Universiteit Leiden branch

Other sources

Phillipps, A. & Lamb, A.L. 1988: – Nature Malaysiana 13(4). p 25
Jebb, M. H. P. & Cheek, M. R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106. p 74
Clarke, C. M. 1997: Nepenthes of Borneo. – Kota Kinabalu: Natural History Publications. 114, f. 76
Danser, B. H. 1996 – In: Phillipps, A. & Lamb, A.L., Pitcher Plants of Borneo. 121, f. 65

Description

Terrestrial or epiphytic climber 2-3 m tall. Climbing stems terete, 6-9 mm diam. Leaves coriaceous, petiolate; leaf blades of climbing stems oblong to elliptic, (10-)18-24.5(-30) by (4.5-)6.6-8.5 cm, apex obtuse to truncate, base obtuse; petiole 2.5-7 cm long, wings 3-4 mm wide, clasping the entire stem, forming a laterally flattened sheath. Longitudinal nerves 3 on each side of the midrib in the outer 1/3, conspicuous. Pennate nerves indistinct. Lower pitchers not known. Upper pitchers slightly infundibulate or cylindrical, laterally compressed, 16-24 by 5-6.5(-9) cm, wings absent, with two ventral ridges; mouth ovate, oblique, concave, rising to the vertical at the rear, forming a short column; peristome mostly cylindrical, sometimes slightly sinuous, 4-6(-10) mm broad at the front, ribs (0.15-)0.3-0.5 mm apart, outer margin entire, inner edge obscurely dentate, teeth 0.3-0.5 mm long with subapical aperture; lid orbicular, 4.2-6 (-8.2) by 4.2-6.5(-8.7) cm, apex rounded, base cordate, lower surface lacking an apical appendage, basal appendage strongly hooked towards the base, laterally flattened, c. 7 mm high, 10 mm long; spur c. 14 mm long, unbranched. Inflorescence known only from fruiting fragment, partial peduncles 2-flowered. A single male flower with pedicel 10 mm long; tepals oblong 5 by 3 mm; androphore 3 mm long; anther head 1.25 by 1.25 mm. Fruit valves c. 30 mm long. Seed fusiform, 13-14 mm long, smooth. Indumentum densely villose, the hairs 4-6 mm long, soft, golden to rust coloured on all surfaces apart from upper leaf blade and inside of pitcher, sparingly hairy on outer pitcher. Colour of outer pitcher pale or yellowish green, peristome sometimes with red streaks.A

Notes

Nepenthes pilosa is one of the Bornean species of the N. maxima group. It is similar and sometimes confused with N. stenophylla, but has laterally compressed yellowish green pitchers which lack red or white blotching, with a strongly hooked basal lid appendage and uniformly longer, denser indumentum. Nepenthes pilosa is widespread throughout Borneo, but rare and incompletely studied: only six collections are known to us. These vary widely in their pitcher proportions. Clarke in Nepenthes of Borneo (1997) 115 reports on the ecology of N. pilosa.
[Move to Typification] The pitcher of the type specimen at BO is badly damaged, and the lid has lost the diagnostic apex of the basal crest. For this reason we propose the epitype above. The illustration in the protologue indicates that the pitcher of the type was not entirely representative of N. pilosa in shape, but this seems within the bounds of infraspecific variation.A

Distribution (General)

Borneo: Kalimantan, Sabah, and Sarawak.A

Habitat

Mossy forest on sandstone; (1000-)1600-1800 m.A

Bibliography

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

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
28 Jan 1899Amdjah 491BO
Citation: Borneo, E Kalimantan, G. Lesung, 28 Jan 1899, Amdjah 491

Specimen summary: BO
Holotype of Nepenthes pilosa Danser

24 Aug 1995Awa & Lee S 50980K, KEP, L, SAR
Citation: Borneo, Sarawak, Bt Lawi, Bario, alt. 1630 m, 24 Aug 1995, Awa & Lee S 50980

Specimen summary: K
Epitype of Nepenthes pilosa Danser

Specimen summary: KEP
Isoepitype of Nepenthes pilosa Danser

Specimen summary: L
Isoepitype of Nepenthes pilosa Danser

Specimen summary: SAR
Isoepitype of Nepenthes pilosa Danser