Nepenthes murudensis

Nepenthes murudensis

Synonymy

Nepenthes murudensis Culham ex Jebb & Cheek in Blumea 42(1): 66. 1997 sec. Cheek & Jebb 2001
    • Holotype: Borneo, Sarawak, Mulu N.P., G. Murud, alt. 2200 m, 13 Sep 1982, Yii Puan Ching S 44623 (K).
    • Isotype: Borneo, Sarawak, Mulu N.P., G. Murud, alt. 2200 m, 13 Sep 1982, Yii Puan Ching S 44623 (SAR).
  • Nepenthes murudensis Culham ex Phillipps & A.L. Lamb, Pitcher Plants of Borneo: 117, f. 63. 1996, nom. nud., syn. sec. Cheek & Jebb 2001

Other sources

Clarke, C.M. 1997: Nepenthes of Borneo: 111, f. 74

Description

Terrestrial climber to 5 m tall. Stem erect, strongly triangular, 4-5 mm diam., internodes 7-8 cm long, axillary buds rounded, projecting less than 1 mm c. 4 mm above the node. Leaves thickly coriaceous, sessile; oblong-elliptic, 4.5-8.6 by 1.5-3 cm, apex rounded to obtuse, base clasping the stem and adnate, decurrent to 2 cm below the node. Longitudinal nerves 4 or 5 on each side of the midrib, closer together near the margin, conspicuous above and below. Pennate nerves obscure. Lower pitchers unknown. Upper pitchers subcylindrical; 12-25 by 2-5 cm; the basal 1/5 swollen, ellipsoid, in the larger pitchers to 4-5 cm wide, the mouth about the same diameter, both tapering gradually to 2-2.5 cm at the centre of the pitcher; with two ridges to 0.1 cm broad lacking fringed elements; the inner pitcher surface glaucous; mouth ovate, oblique; peristome cylindrical to slightly flattened in section, 1.5-2 mm wide, with very low ribs 0.1-0.2 mm high, 0.4-0.5 mm apart, outer edge not sinuate, the inner edge appearing entire; lid ovate to obovate, 2.7-5.5 by 2-4 cm, apex rounded, base rounded-truncate, lower surface without appendages, nectar glands crater-like, small, rounded, with lumina c. 0.15 mm diam., 320-440 per cm2; spur simple, stout, blunt and slightly flattened, to 9 by 1.5 mm, or filiform with numerous branches, to 9 mm long, puberulent. Male inflorescence to 9 cm long; peduncle to 2.3 cm long; partial peduncles 1-flowered; bracts absent; pedicels 0.4-0.7 mm long; androphore to 2 mm long; anther head to 0.9 mm wide. Infructescence c. 11 cm long; peduncle c. 5 cm long; pedicels 4-7 mm; tepals oblong, 4-4.5 by 1 mm, inner surface densely covered in raised elliptic glands. Fruits with valves 14-22 by 3-4 mm. Seeds filiform, 10 by 1 mm. Indumentum of short dense pale brown velvety, erect 3-5-branched hairs 0.25-0.5 mm long; persisting on stems, midrib and inflorescence axis; leaf blade glabrous; pitcher inconspicuously hairy with scattered appressed, simple white hairs 0.1-0.3 mm long; lid subglabrous; fruit valves with strongly appressed white or brown hairs c. 0.5 mm long. Colour of stem and midribs black; pitchers green, sometimes suffused with red or with black streaks on the back side; inner surface pale green or almost white, glaucous; peristome green or bronze; fruits brown.A

Notes

Nepenthes murudensis has been confused with the lower altitude N. reinwardtiana which it resembles in the shape of the upper pitchers, but differs in lacking the inner pitcher ‘eye-spots’ and visibly perforate inner peristome margin. The stem, leaf shape and aspects of the pitcher morphology and the small inflorescence are those of the variable and widespread N. tentaculata with which N. murudensis has also been confused. Nepenthes tentaculata differs from N. murudensis in being a much more slender species with multicellular hairs on an ovate lid. Both N. reinwardtiana and N. tentaculata have glabrous stems unlike the densely velvety hairy stem of N. murudensis.
As first indicated by Phillipps & A.L. Lamb [Nepenthes reinwardtiana x N. tentaculata?, Phillipps & A.L. Lamb, Nature Malaysiana 13, 4 ( 1988) 9.], this species is somewhat intermediate between N. reinwardtiana and N. tentaculata. Indeed, N. murudensis may have originated as a hybrid between these two species. With the former it shares a pitcher with a ventricose base, a narrow waist and flared mouth, with the latter it shares a broad adnate leaf, and a fasciculated spur with tentacle-like appendages. The relatively large pitchers combined with the small oblong leaves which clasp the stem distinguishes the species from all others.A
Belongs to Nepenthes sect. Tentaculatae Cheek & JebbB

Distribution (General)

Borneo: Sarawak, known only from Gunung Murud (also known as Mt Murut).A

Habitat

Stunted scrub-forest, or moss forest on sandstone; 2200-2500 m.A

Bibliography

A. Cheek, M.R. & Jebb, M.H.P. 2001: Flora Malesiana - Nepenthaceae, Series I, Volume 15
B. Cheek, M.R. & Jebb, M.H.P. 2016: A new section in Nepenthes (Nepenthaceae) and a new species from Sulawesi. – Blumea 61: 59-62

Images

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
1982-09-13Yii Puan Ching S 44623K, SAR
Citation: Borneo, Sarawak, Mulu N.P., G. Murud, alt. 2200 m, 13 Sep 1982, Yii Puan Ching S 44623.

Specimen summary: K
Holotype of Nepenthes murudensis Culham ex Jebb & Cheek

Specimen summary: SAR
Isotype of Nepenthes murudensis Culham ex Jebb & Cheek