Nepenthes negros

Nepenthes negros

Synonymy

Nepenthes negros Jebb & Cheek in Nordic J. Bot. 31(5): 619. 2013 sec. Cheek & Jebb 2013
    • Type (designated by Cheek, M.R. & Jebb, M.H.P. 20131): Philippines, Negros Island, Mt Silay, May 1906, H. N. Whitford 1537 holotype: PH, isotype: K).
  • 1. Cheek, M.R. & Jebb, M.H.P. 2013: Typification and redelimitation of Nepenthes alata with notes on the N. alata group, and N. negros sp. nov. from the Philippines. – Nordic Journal of Botany 31: 616-622
  • =Nepenthes alata var. biflora Macfarl. in Engler, Pflanzenr. IV. 111 (Heft 36): 72. 1908 syn. sec. Cheek & Jebb 2013
    • Type (designated by Jebb, M.H.P. & Cheek, M.R. 19972): Philippines, Negros Island, Mt Silay, May 1906, H. N. Whitford 1537(lectotype: K, isolectotype: PH).
  • 2. Jebb, M.H.P. & Cheek, M.R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106

Description

Terrestrial climber, reaching 4–5 m high, stems terete or angular, 4–6 mm in diameter, internodes 3.5–4.5 cm long, axillary buds spike-like ca 4 mm long, inserted 4 mm above the axil, indumentum not caducous of grey or red, patent dendritic hairs 0.1–0.5 mm long, each with 2–7 scattered short lateral branches ca 0.05 mm long. Leaves spirally inserted, coriaceous, blade oblong-elliptic (10.0–) 11.0–15.5(-18.0) X (1.3–)2.4–3.8(-4.0) cm, apex obtuse, base obtuse-acute, abruptly decurrent into petiole, longitudinal nerves 1 pair, 3 mm from the margin, obscure or moderately conspicuous; pennate nerves patent, upper surface glossy, glabrous, lower surface drying brown, with scattered raised glands ca 0.05 mm diameter, glabrous or occasionally (Elmer 9725, W) with moderately dense bushy white hairs 0.25 mm long, midrib densely pubescent with basally bifid, patent, hairs 0.4–0.5 mm long. Petiole winged- canaliculate, (1.5–)3.4–5.7 X (0.4–)0.5–0.7 cm, clasping for 1/3 its circumference and often decurrent to node below as a low ridge. Lower and intermediate pitchers unknown from specimens. Upper pitchers (tendrils coiled) subcylindric, 13.0–18.5 X 3.4–5.0 cm, widest in the basal half, gradually constricting midway to 1.7–3.6 cm wide before dilating to 3–4 cm wide below the peristome outer surface with erect red, 4–5-armed bushy hairs 0.5–1.0 mm long, with one long arm, other arms ca 0.2 mm long, sparse, 1–2 per mm2, mixed with smaller (2–)3–6-armed substellate hairs 0.15(–0.25) mm diameter, 7–9 per mm2; fringed wings 10–30 mm long, (1–)2–3 mm wide, fringed elements 1–2 mm long, 3–5 mm apart, immediately below the peristome, otherwise reduced to ridges running the length of the pitcher. Mouth ovate, 3.0–5.5 X 3.0–4.5 cm, oblique; peristome cylindric to flattened, 1.2–2.0 mm wide at front, 2–6 mm wide at sides, 3.0–3.5 ridged per mm, ridges 0.1–0.2 mm high, inner edge with inconspicuous teeth, outer edge not, or only indistinctly lobed; column not developed; lid orbicular, 2.2–4.3 X 2.5–4.0 cm, apex rounded to truncate, base slightly cordate; lower surface with basal appendage asymmetric, 2–4 X 2–4 mm, apex rounded, situated about the middle of a ridge ca 10 mm long, 1 mm high; nectar glands monomorphic, non-perithecoid, more or less circular, with a slight and slender marginal rim, densest in the proximal half flanking the appendage, about 4 nectar glands per mm², each 0.12 mm diameter, equally dense and small on the appendage and basal midline, becoming much sparser and slightly larger (0.15–0.40 mm diameter) in the distal half and periphery; upper surface of lid with moderately dense, erect, branched hairs 0.1–0.3(-0.5) mm long. Spur inserted ca 3 mm below junction of lid and pitcher, cylindric, 7–10 mm long, unbranched, apex rounded, surface densely appressed hairy, hairs coppery, 0.5–0.7 mm long. Male inflorescence with peduncle 19.5–26.0 cm long, 0.3–0.4 mm diameter at base, glabrous; rachis 26.5 cm long, 2–3 mm diameter, bearing ca 94 partial-peduncles evenly scattered along its length, partial-peduncles 2-flowered from base to apex of inflorescence, partial-peduncles (3.0–)3.5–4.0 mm long, bracts absent, pedicels divergent (7–)8–10(–12) mm long, rhachis to lower surface of tepals dense patent puberulent, hairs red or grey, erect 0.4–0.5 mm long and subappressed, 2–3-armed hairs 0.20–0.25 mm wide. Tepals 4, elliptic, 3(-4) X 2.0(-2.5) mm, apex rounded, lower surface with subappresed simple hairs 0.15–0.25 mm long, margin densely patent hairy, hairs 0.03–0.10 mm long, upper sur- face with elliptic nectar glands, drying black, live colour green, glabrous apart from hairs at base. Androphore 2.0(-3.5) mm long, proximal half with thinly scattered patent red hairs, distal half glabrous. Anther-head white, subglobose 1.5 X 1.5 mm. Female inflorescence not known. Infructescence peduncle with indumentum as male inflorescence, 24–39 cm long, 2–5 mm diameter at base, rhachis 11.5–12.5 cm long, partial-peduncles ca 35. Partial-peduncles 4–8 mm long, 2-flowered. Bracts absent. Pedicels 7–8 mm long. Tepals elliptic 3.50 X 1.75 mm, ovary stipe 1 mm. Fruit valves 4, narrowly elliptic, 25.0 X 2.5 mm, outer surface patent-puberulent, hairs 0.05 mm long.A

Conservation

Assessed as ‘Critically Endangered’ (CR) under criterion D of IUCN (2001).A

Distribution (General)

Philippines, Visayas, Biliran Island and Negros Island.A

Etymology

The specific epithet is a noun in apposition. It signals the main home of this species, the Philippine Island of Negros.A

Habitat

Submontane forest; 1350 m a.s.l. A

Bibliography

A. Cheek, M.R. & Jebb, M.H.P. 2013: Typification and redelimitation of Nepenthes alata with notes on the N. alata group, and N. negros sp. nov. from the Philippines. – Nordic Journal of Botany 31: 616-622

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Philippines, Negros Island, Mt Silay, May 1906, H. N. Whitford 1537 holotype: PH, isotype: K).
Citation: No Citation available. This specimen either has no or multiple field units.

Philippines, Negros Island, Mt Silay, May 1906, H. N. Whitford 1537(lectotype: K, isolectotype: PH).
Citation: No Citation available. This specimen either has no or multiple field units.