Nepenthes boschiana

Nepenthes boschiana


Nepenthes boschiana Korth. in Verh. Nat. Gesch. Ned. Bezitt., Bot. 19: 25 (t. 2, 4[39-54]). 1840, , sec. Cheek & Jebb 2001 wfo-0001302529
      Lectotype: Indonesia, Borneo, S Kalimantan, G. Sakoembang, alt. 950 m, 1836, P.W. Korthals s.n. (L; isotypes: B, K, L, W)
  • =Nepenthes borneensis J.H.Adam & Wilcock in Gard. Bull. Singapore 42: 26, t. 1, f. 1. 1990 syn. sec. Cheek & Jebb 2001 wfo-0000381869
    • Indonesia, Kalimantan Selatan, Gunong Besar, alt. 1300 – 1880 m, 18 Feb 1979, Murata, Kato & Mogea B-3455 (HLB. 478518) ()

Other sources

Clarke, C. M. 1997: Nepenthes of Borneo. – Kota Kinabalu: Natural History Publications. 71, f. 45 & 46
Danser, B. H. 1928: – Bull. Jard. Bot. Buitenzorg, sér. 3, 9. p 275
Nepenthes borneensis J.H.Adam & Wilcock: Jebb, M. H. P. & Cheek, M. R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106. p 26 (as Nepenthes borneensis J.H.Adam & Wilcock)
Jebb, M. H. P. & Cheek, M. R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106. p 27


Terrestrial shrub or climber to c. 5 m tall. Stems of short shoots terete, 0.9 cm diam., internodes c. 2 cm long; tall shoots with internodes 2-3 cm long, (0.7-)1.1 cm diam., slightly 2-winged or 2-ridged, axillary buds spike-like. Leaves chartaceous, petiolate, those of short stems oblong, 18-19(-28) by 10 cm, apex broadly acute, not peltate, base abruptly attenuate; petiole canaliculate, 6.5-10 by 0.5 cm, sheathing and clasping the stem for 5/6 of its circumference; leaves of tall shoots lanceolate or oblong-lanceolate, 16-26 by 3.8-6.5(-7) cm, apex acute, peltate by 1-2 mm or not peltate, base gradually attenuate; petiole 3-7.5(-10) cm long, 0.75-1(-1.7) cm wide at the base, sheathing and clasping the stem for 1/2 its circumference, then decurrent in two appressed or patent wings, each up to 2 mm wide, descending to the node below as an arc, diminishing to ridges. Longitudinal nerves 2(-4) on each side of the midrib in the outer 1/3-1/2. Pennate nerves numerous, oblique, straight, reaching the margin. Longitudinal and pennate nerves fairly conspicuous above and below in short stem leaves, inconspicuous in tall shoot leaves. Lower pitchers 17-22 cm long, ellipsoid in the lower half, c. 4 cm broad, contracted to 2 cm at the centre, the upper half cylindrical to slightly infundibulate, c. 3 cm broad at the mouth; with two fringed wings 3 mm wide, fringed elements 5-7 mm long, 1-5 mm apart; mouth ovate, highly concave and oblique, rising abruptly at the rear to form a column; peristome subcylindrical, 5 mm wide, ribs conspicuous, 0.2 mm high, 0.5 mm apart, the outer edge infrequently sinuate-lobed, lobes to 5 mm long, inner edge toothed near the column; lid ovate, 5.5 by 3.5 cm, apex round-ed, base truncate to cordate, lower surface with a long keel, 2-3 mm high, along the midrib, but lacking a protruding appendage, nectar glands as in upper pitchers, 0.2 mm diam., sparsely scattered over the entire surface; spur dorsiventrally flattened, 6-8 by 1 mm, apex rounded. Upper pitchers entirely cylindrical, narrowly infundibulate, or ellipsoid in the lower 1/4-1/3 and cylindrical above, 15-30 cm tall, 4-6 cm wide, lacking fringed wings, but with two ridges c. 0.5 mm wide; mouth ovate or orbicular, oblique, slightly to markedly concave, rising at the back to a short column, peristome subcylindrical, the outer part flattened, 9-28 mm wide, ribs conspicuous, c. 0.2 mm high, 0.5-0.75 mm apart, the outer edge deeply or shallowly undulate-sinuate, with up to 7 lobes per side, inner edge slightly toothed at the column; lid orbicular, 3.8-6.2 by 5-6.5 cm, apex rounded, base cordate, lower surface with a keel along the midrib 8-12 by 1-2 mm high, with an appendage up to 3 mm high; nectar glands circular, 0.2-0.4 mm diam., broadly bordered, either evenly scattered, moderately densely, over the surface of the lid, or, the largest glands densely concentrated in two arms diverging from the keel towards the apex, the remainder of the lid with smaller, sparsely scattered glands; spur as in lower pitcher. Inflorescences incompletely known, rhachis with 2-flowered partial peduncles at base, 1-flowered above. Male inflorescence known only from fragments, partly 1-flowered and partly 2-flowered, partial peduncles 1-2 mm; bracts absent; pedicels 7-9 mm; tepals oblong-elliptic, 4-4.5 by 1.5-2 mm, reflexed; androphore 3.5 mm; anther head 1.5 by 1.5 mm. Infructescence 91 by 7.5 cm; peduncle 51-55 cm long, 1-1.2 cm wide at the base; partial peduncles 4-10 mm long; bracts absent; pedicels 7-14 mm long. Fruit with valves 25 by 2.5 mm. Seed filiform, 24 by 0.5 mm. Indumentum of stems obscurely simple, branched and substellate red-brown hairs 0.2 mm long, mixed with sessile glands; midrib above, edges of petiole and wings of stems with pale brown simple and branched hairs 0.5-0.7 mm long; lower surface of leaves with sessile glands only; male inflorescence axis white-puberulent as the stem, androphore glabrous. Colour of dried stem and leaf blackish grey; pitchers pale or yel-lowish green splashed lightly to heavily with red to purple; inflorescence colour unknown.A


On the evidence of Ch. Clarke (pers. comm. and Nepenthes of Borneo (1997) 72-73) and of specimens that we have seen since our skeletal revision (Jebb & Cheek Blumea 42 (1997)), we here unite N. borneensis J.H. Adam & Wilcock with N. boschiana, which we previously maintained as distinct species (op. cit.). Clarke reports that at the type locality of N. borneensis (G. Besar), he has seen in one population plants with the pitcher, peristome and lid appendage characteristics of N. borneensis, other plants with the characteristics of N. boschiana, and intermediates between both. The previously overlooked De Vogel 1934, from a third locality in the same mountain range, is also intermediate in several characters between N. borneensis and N. boschiana. Nepenthes boschiana is a polymorphic species and still poorly known: more study is needed to evaluate its variability and habitat.
Nepenthes boschiana seems closely related to N. stenophylla and N. faizaliana of Sarawak, but differs in always having arcuate stem wings (if present at all in the latter species they are straight), a less pronounced basal lid appendage (in the latter species it is 3-5 mm long), in the glabrous androphore (pubescent in the latter two species), in the sparse indumentum of white, simple hairs 0.2 mm long on the stem (in the latter the stem indumentum is dense, covering the surface of the stem, and usually brown and longer than 0.2 mm). Neither N. stenophylla nor N. faizaliana ever have a peristome as broad or as undulating as seen in the type collection of N. boschiana, nor a pitcher with a ventricose basal 1/4-1/3 and a narrowly cylindrical upper part. However, it seems that these characters are just an extreme variant of N. boschiana and not characteristic of that species. Nepenthes boschiana shares with N. faizaliana the affinity for limestone (as Ch. Clarke first pointed out (Nepenthes of Borneo (1997) 73), and also infructescences/inflorescences reaching over 90 cm long.
Danser in Bull. Jard. Bot. Buitenzorg III 9 (1928) 275 reinstated N. boschiana in the sense we use it here, after the name had been applied differently by earlier authors. Miquel included within N. boschiana what we now accept as N. sumatrana Beck, whilst Beccari included N. boschiana within his concept of N. maxima Nees. Both Hooker and Macfarlane included N. stenophylla Mast. within N. boschiana.B

Distribution (General)

Borneo: S Kalimantan (Meratus Mt Range: G. Sakoembang, G. Sarempaka, G. Besar).A


Open, stunted forest on limestone hills; 780-1880 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
B. Jebb, M. H. P. & Cheek, M. R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106



CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Indonesia1836Korthals, P. W. s.n.B, K, L, W
Citation: Indonesia, Borneo, S Kalimantan, G. Sakoembang, alt. 950 m, 1836, P.W. Korthals s.n.

Specimen summary: B
Isotype of Nepenthes boschiana Korth.

Specimen summary: K
Isotype of Nepenthes boschiana Korth.

Specimen summary: L
Lectotype of Nepenthes boschiana Korth.

Specimen summary: W
Isotype of Nepenthes boschiana Korth.

Indonesia18 Feb 1979Murata, Kato & Mogea B-3455 (HLB. 478518)
Citation: Indonesia, Kalimantan Selatan, Gunong Besar, alt. 1300 – 1880 m, 18 Feb 1979, Murata, Kato & Mogea B-3455 (HLB. 478518)

Specimen summary: Indonesia, Kalimantan Selatan, Gunong Besar, alt. 1300 – 1880 m, 18 Feb 1979, Murata, Kato & Mogea B-3455 (HLB. 478518)
Type for: Nepenthes borneensis J.H.Adam & Wilcock