Nepenthes bokorensis

Nepenthes bokorensis

Synonymy

Nepenthes bokorensis Mey in Carniflora Australis 7(1): 8 (6-15; figs.). 2009 sec. Mey, F.S., 2009
    • =Nepenthes bokor Cheek in Kew Bull. 64(2): 320 (-321, fig. 1). 2009 syn. sec. Mey, F.S., 2010

    Description

    Climbing shrub 1.5 - 3 m high. Rosette and short stems unknown. Climbing stems terete, subglossy, 6 - 8 mm diam., internodes 1.5 - 6 cm long, axillary buds absent. Leaves pseudo-petiolate, coriaceous, lanceolate to narrowly oblong and subspatulate, 21 - 32 (- 37) x 3 - 5 (- 9) cm, blade apex broadly acute, not peltate, ± symmetrical, pseudopetiole 3.5 - 4 x 1.2 (- 1.7) cm, dilating at the node, decurrent down the stem for 9 - 17 (- 22) mm, clasping the stem for ¾ -5/6 of its circumference, projecting from the stem as wings c. 5 mm wide. Longitudinal nerves 3 - 4 (- 5) on each side of the midrib in the outer 1/3 inconspicuous. Pennate nerves inconspicuous. Lower pitchers ovoid, c. 9 x 6 cm, with two fringed wings c. 11 mm wide extending the length of the pitcher, fringed elements 2 - 6 mm long, 6 - 8 per cm; mouth slightly concave in profile, rising steeply c. 5 cm from front to rear, column not distinct; peristome subcylindric, not flattened, 3 - 4 mm wide, expanding to 6 mm wide towards the lid, with outer edge entire, ridges 0.25 mm apart, c. 0.1 mm high, the inner edge with teeth 0.5 mm long; lid elliptic, c. 4.2 x 3 cm, apex rounded­truncate, base rounded, lower surface lacking distinct appendages or ridge when dried, nectar glands thin­walled, longitudinally elliptic along the midrib, c. 0.6 x 0.25 mm, otherwise scattered over the lower surface of the lid, directed towards base and midrib of lid, circular, volcano-like, c. 0.25 mm diam., decreasing in size at the margin, absent from outer 5 mm; spur filiform, c. 6 mm. Intermediate pitchers not seen. Upper pitchers with tendrils coiled, pitchers narrowly infundibuliform to cylindrical (16.5 -) 21 - 30 cm tall, 'hip' c. 1/3 the length from the base, 3.3 - 5 cm wide; waist, above the hip, slightly constricted, (1.8 -) c. 2.8 cm wide, dilating gradually towards the mouth, where (3.5 -) 4 - 5.7 cm wide, wings absent; mouth slightly concave in profile, occupying the upper (3.5 -) 4.5 - 7.6 cm of the pitcher, ovate-cordate; peristome flattened, 4 - 9 mm wide, ± even in width, column not well-defined; often raised at front into an acute, triangular lobe 4 - 10 mm high; ridges distinctly pronounced, 0.3 - 0.5 (- 1) mm apart, c. 0.1 - 0.2 mm high , the inner edge with teeth just visible near the column; teeth 0.1 mm long; lid suborbicular, wider than long, 4 - 6.5 (7.8) x 4.2 - 6.5 (- 7) cm; apex retuse, the notch 0 - 4 mm deep, with sides shallowly convex, rarely apex rounded; base shallowly cordate; lower surface lacking keel or appendages when dried; nectar glands angled towards the base and centre of the lid, scattered densely (c. 400 - 500 per cm2), circular, volcano-like, crater walls with radiating striations, glossy, 0.12 - 0.25 mm diam. midrib area with 10 - 20 sparse longitudinally elliptic glands c. 0.5 mm long absent from marginal 1 - 2 mm; spur inserted c. 4 mm from the lid, c. 7 mm long, unbranched, apex rounded. Male inflorescences c. 60 cm long; peduncle c. 42 cm long, c. 4 mm diam. at base, partial-peduncles c. 60, 2-flowered (the distal quarter of rhachis 1-flowered), c. 2.5 mm long; bracts inserted 0.5 - 1.5 mm from the base of the partial­ peduncle, filiform, 0.5 - 1.5 mm long; pedicels (4-) 5 - 6.5 mm long; tepals elliptic 3.25 - 4.5 mm; androphore 2 - 3 mm long; anther head 0.6 - 1 x 1 - 1.25 mm long, anthers c. 5. FemalR inflorescences 18 - 26 cm long; peduncle 9 - 10 cm long, partial­ peduncles 20 - 30, 1-flowered; bracts inserted 3 mm from the base of the pedicel, filiform, 0.7 mm long; pedicel 9 - 12 mm long; tepals 4 - 5 x 2 mm; stipe 1.5 - 2 mm long; ovary obclavate, 8 - 12 mm long. lnfructescence similar to female inflorescence, tepals persistent. Fruit valves 4, c. 18 mm long. Seeds not seen. lndumentum of stems, leaves and outer pitchers moderately dense, 0.25 - 0.5 mm long, patent, predominantly simple but often with a short branch, slightly crinkled, 7 - 8 hairs per mm2 stem hairs pale brown, soon lost by abrasion, but persisting in leaf axils; leaves completely concealed by dense red hairs when in bud, persisting in mature leaves, where not abraded, upper surface of leaves with grey-brown, shorter (0.1 - 0.25 mm) hairs, lower surface with brown hairs, pitchers' hairs shorter, 0.1 - 0.2 mm long, red brown; leaves with sessile red glands 8 - 10 per mm2. Pitcher lid upper surface, lower margin 1 - 10 mm wide, and outer pitcher (adjacent to peristome) with 5 - 8-armed red, erect dendroid hairs, c. 0.25 mm long; spur densely brown puberulent. Inflorescence with appressed grey or red-brown simple hairs c. 0.25 mm long, sparser on peduncle, absent from adaxial tepal surface; androphore shortly puberulent to subglabrous. Colour of live pitchers green, purple­ mottled, peristome reddish, purple-banded; inner pitcher greyish-reddish purple blotched; lid reddish purple on lower surface (Smitinand 6496). Dry specimens with subglossy, dark brown stems, leaves grey-green, pitchers red-brown, peristome glossy brown, inner pitcher mottled purple, lower lid glossy chestnut brown, flower colour not recorded.A

    Notes

    Member of the Montanae species group.B

    Distribution (General)

    Cambodia, Kampot Province, Chaîne des Elephants.C

    Habitat

    Edge of submontane evergreen forest; c. 1000 m.D

    Bibliography

    A. Cheek, M.R. & Jebb, M.H.P., Nepenthes group Montanae (Nepenthaceae) in Indo-China, with N. thai and N. bokor described as new in Kew Bull. 64(2): 319-325. 2009 (as Nepenthes bokor Cheek in Kew Bull. 64(2): 320 (-321, fig. 1). 2009)
    B. Cheek, M.R. & Jebb, M.H.P., Nepenthes group Montanae (Nepenthaceae) in Indo-China, with N. thai and N. bokor described as new in Kew Bull. 64(2): 319-325. 2009 (as Nepenthes bokor Cheek in Kew Bull. 64(2): 320 (-321, fig. 1). 2009)
    C. Cheek, M.R. & Jebb, M.H.P., Nepenthes group Montanae (Nepenthaceae) in Indo-China, with N. thai and N. bokor described as new in Kew Bull. 64(2): 319-325. 2009 (as Nepenthes bokor Cheek in Kew Bull. 64(2): 320 (-321, fig. 1). 2009)
    D. Cheek, M.R. & Jebb, M.H.P., Nepenthes group Montanae (Nepenthaceae) in Indo-China, with N. thai and N. bokor described as new in Kew Bull. 64(2): 319-325. 2009 (as Nepenthes bokor Cheek in Kew Bull. 64(2): 320 (-321, fig. 1). 2009)