Danser's Monograph on Nepenthes: Nepenthes papuana

34. Nepenthes papuana DANS., nova Spec.; N. neoguineensis RIDL., Transact. Linn. Soc., ser. 2, bot., IX, p. 139 (1916) ; non MACF., Nov. Guin. VIII, 1, p. 340, t. LXVII (1911).

Icon: nostra 16.

Folia mediocria subpetiolata, lamina lanceolata, nervis longitudinalibus utrinque 4-6, basi valde attenuata, semiamplexicauli ; ascidia rosularum parva, parte inferiore oblique ovata, os versus sensim attenuata, alis 2 fimbriatis ; peristomio operculum versus acuto, applanato, 1-2 mm lato, costis c. 1/2 mm distantibus, dentibus 1-2 x longioribus quam latis ; operculo orbiculari facie inferiore plano ; ascidia inferiora ut rosularum sed margis elongata ; ascidia superiora parte c. 1/3 inferiore paulum ventricosa, os versus cylindrica v. primum paulum angustata os versus infundibuliformia, alis 2 fimbriatis v. efimbriatis v. costis 2 prominentibus ; peristomio operculum versus acuto, applanato, 1-2 mm lato, costis c. 1/2 mm distantibus, dentibus 1-2 x longioribus quam latis ; operculo suborbiculari subcordato, facie inferiore plano ; inflorescentia racemus pedicellis inferioribus 10-12 mm longis 1-floris v. 2-floris, superioribus brevioribus 1-floris ; indumentum breve ferrugineum tomentosum, in partibus vegetativis parcissimum, in costa et margine foliorum tantum distinctum, in inflorescentiis subdensum permanens.

Stems climbing, the part with adult leaves cylindrical, 5 to 7 mm thick, the internodes 2 to 5 cm long ; at the base of older plants also short shoots and rosettes. Leaves of the rosettes thin-coriaceous, sessile, lanceolate, about 2 to 10 cm long, 0.3 to 2 cm broad, acute, attenuate towards the dilated amplexicaul base ; nervation invisible in the smallest leaves, in the larger leaves pennate and parallel, the pennate nerves indistinct, the longitudinal ones very distinct, up to 4 on each side, originating from the basal part of the midrib, running parallel in the outer half of the lamina ; tendrils 1 1/2 to 11 cm long, hanging. Leaves of the short shoots scattered, thin-coriaceous, almost short-petioled, lanceolate, 8 to 15 cm long, l l/2 to 2 1/2 cm broad, acute, gradually and strongly attenuate towards the base, tapering into a canaliculate, petioliform part, which is up to 1 cm long, hardly winged and forming a laterally flattened very short sheath ; pennate nerves very indistinct, running obliquely towards the margin and forming an irregular network, the longitudinal nerves very distinct, mostly 4 on each side, originating from the basal part of the midrib, running strikingly parallel in the outer half of the lamina ; tendrils hanging, about as long as the leaves, slender, almost 1 mm thick, without curl. Leaves of the climbing stems scattered, coriaceous, sessile or indistinctly and shortly petioled, lanceolate, about 15 to 30 cm long, 2 1/2 to 5 cm broad, acute, gradually attenuate towards the base, hardly petioled, the petioliform part at most 4 cm long, with wings at least 3 mm broad, not or hardly sheathy at the base, semiamplexicaul, pennate nerves running obliquely towards the margin, irregularly reticulate especially near the margin, longitudinal nerves very distinct, 4 to 6 on each side, originating from the very basal part of the midrib, running parallel in the outer 1/2 to 2/3 part of the lamina ; tendrils 1 x to 2/3 x as long as the leaf, the pitcher-bearing ones with a curl about half the length, about 1 mm thick near the lamina, 2 mm near the pitcher. Pitchers of the rosettes very shortly incurved from the hanging end of the tendril, obliquely ovate in the lower part, gradually narrowed towards the mouth, 3 to 6 cm high, 1 1/4 to 2 1/2 cm wide in the lower part, 1 to 1 3/4 cm wide below the mouth, with 2 fringed wings over the whole length, the wings 2 to 4 mm broad, the fringe segments 1 to 3 mm long, 1/2 mm apart on the average ; mouth oblique, acute and slightly incurved towards the lid, 1 to 2 mm broad, somewhat broader near the lid than in front, the ribs about 1/2 mm apart, the teeth of the interior margin once to twice as long as broad ; inner surface of the pitcher glandular in the lower 2/5 to 1/3 part, the glands but little overarched ; lid suborbicular, slightly cordate, 1 to 2 cm long and broad, the lower surface without appendages, with many small deepened hardly rimmed glands near the middle ; spur not branched, flat,

. Fig. 16. Nepenthes papuana ; a. & b. parts of a female plant, 1/2 x (DOCTERS VAN LEEUWEN 10341) ; c. rosette of the same plant, 1/2 x ; d. male raceme, 1/2 x (idem 10340).

inserted near the lid, seemingly branched by a small number of filiform appendages inserted on both sides of the lid, which are about as long as the spur. Pitchers of the short stem almost like those of the rosettes, somewhat more slender, about 7 cm high, 2 cm wide in the lower part, about 1 1/4 cm at the mouth. Pitchers of the upper leaves gradually originating from the hanging end of the tendril, incurved with a curve 6 to 12 mm wide, shortly infundibuliform in the basal part, slightly ventricose on 1/3 to 2/7 of its length, in the upper part wholly tubulose or first slightly attenuate and dilated to the mouth, 12 to 15 cm high, 2 1/2 to 3 cm wide in the lower part, with 2 narrow wings over the whole length which are fringed or not, the wings also present in the curved part or not, 2 1/2 mm to less than 1 mm broad, the fringe segments up to 3 mm long, usually less than 2 mm apart ; mouth oblique, acute towards the lid ; peristome flattened, 1 to 1 1/2 or near the lid 2 mm broad, the ribs about 1/2 mm apart, the teeth of the interior margin 1 to 2 x as long as broad ; inner surface of the pitcher glandular in the ventricose part, the glands deepened but little overarched about 400 to 500 on 1 cm2 ; lid nearly round, little more long than broad, slightly but distinctly cordate at the base, 2 1/2 to 3 1/2 cm long, 2 1/4 to 3 1/4 cm broad, the lower surface almost flat, with many small, deepened, thickly rimmed glands, which are densely set near the basal part of the midrib, scattered towards the margin ; very rarely a beginning of a keel in the basal part of the midrib or the beginning of a conical appendage near the apex ; spur inserted close to the lid, flattened, 2 to 3 mm long, not branched. Male inflorescence a raceme, the peduncle about 6 cm long, 2 mm thick, the axis about 14 cm long, attenuate to half its diameter, very angular and grooved, the lower pedicels up to 10 mm long, the upper ones gradually shorter, about 5 mm long, all of them 1-flowered, without bract. Tepals suborbicular, about 3 mm long, 2 1/2 mm broad. Staminal column 3 to 4 mm long, the anthers included. Female inflorescence almost like the male one, the peduncle about 12 cm long, 2 1/2 mm thick, the axis 10 to 15 cm long, the pedicels 12 to 15 mm long, the lower ones sometimes 2-flowered. Tepals oblong. Ovary sessile. Fruit 25 to 35 mm long, the valves lanceolate, 3 to 5 mm broad, gradually attenuate towards both ends with 2 tips at the apex, which are acute and curved outwards. Seeds filiform, 12 to 15 mm long, the nucleus indistinctly transversely wrinkled. Indumentum generally sparse and short ; stems and leaves glabrous from the beginning, with exception of the midrib which is densely and shortly brown-tomentose beneath when young, and of the margin, which bears a persistent brown-velvety border, deciduous only when the leaf is old ; tendrils hairy like the midrib beneath, more and persistently hairy towards the pitcher ; pitchers densely and shortly stellate-hairy when young, the lower ones sparsely stellate-hairy when adult, the upper ones soon glabrous or very sparsely stellate-hairy ; inflorescences densely brown-tomentose when young, less densely afterwards, at length sparsely stellate-hairy ; perigone very shortly and densely stellate-hairy, staminal column sparsely hairy, ovary very densely stellate-tomentose, fruit with deepened points and pretty densely hairy also in the adult state. Colour in the living state: upper pitchers almost entirely green, towards the mouth and on the lid with few red spots, the rosette pitchers more red-spotted, often hidden in the humus of the forest and etiolate. Colour of herbarium specimens red-brownish, the upper surface of the leaves yellow-brownish. [Description after the numbers DOCTERS VAN LEEUWEN 10282 (0), 30340 (m), 10341 (f)].

NEW GUINEA. Northwestern part: border of affluent C of the Rouffaerrivier, 250 m, IX 1926, DOCTERS VAN LEEUWEN 10258 ter, H. B. (0) ; 10282, H. B. (0) ; 300 m, IX 1926, DOCTERS VAN LEEUWEN 10340, H. B. (m) ; 10341, H. B. (f) ; Southwestern part: Wollaston Expedition, camp VIa, 920 m, 5 I 1913, KLOSS, H. S. (0) ; northern part of the Noordrivier, on a hill (below 750 m), 7 X 1909, VON RÖMER 454, H. B. (0) ; VON RÖMER 900, H. B. (0).

N. papuana is so much alike N. neoguineensis in its vegetative parts, that only the complete knowledge of the generative parts has suggested me to establish a new species. The inflorescence of N. papuana is a raceme with only or almost only 1-flowered pedicels, as well in the male as in the female plant. Therefore I believe that the plant RIDLEY describes (l.c.) as the male plant of N. neoguineensis belongs to this species. As far as is obvious from the material seen by me, there are constant differences also in the vegetative parts: the longitudinal nerves are very distinct, the pennate nerves indistinct, whereas in N. neoguineensis the contrary is the fact ; the leaves are strikingly densely ciliate in N. papuana, much less distinctly in N. neoguineensis ; the wings too are less developed in the upper pitchers of N. papuana and the fringe segments are less apart. When my determinations of the not-flowering plants are right, N. papuana is already known from a rather large region in western New Guinea. The elevations recorded vary from 250 to 920 m ; the habitat is the virgin forest. We therefore may expect a still larger distribution.

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