Nepenthes dubia

Nepenthes dubia

Synonymy

Nepenthes dubia Danser in Bull. Jard. Bot. Buitenzorg, sér. 3, 9: 285, f. 4. 1928 sec. Clarke 2001
    • Lectotype (designated by Jebb, M.H.P. & Cheek, M.R. 1997: 361): Indonesia, Sumatra, Mt Talamaku (Ophir), alt. 1900 m, 29 May 1917, Bünnemeijer 938 (BO).
    • Isotype: Indonesia, Sumatra, Mt Talamaku (Ophir), alt. 1900 m, 29 May 1917, Bünnemeijer 938 (BO).
  • 1. Jebb, M.H.P. & Cheek, M.R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106

Description

Stem: climbing, ≤ 3 m in length, ≤ 0.4 cm in diameter, internodes ≤ 10 cm long, cylindrical.
Leaves: sessile; lamina lanceolate-spathulate, ≤ 10 cm long, ≤ 2 cm wide, apex acute, lamina gradually attenuate towards the base, which clasps the stem for up to half its circumference. Longitudinal veins 3 on each side of the midrib, pennate veins not easily distinguished, tendrils ≤ 15 cm long.
Rosette and lower pitchers: infrequently produced, lower 2/3 narrowly infundibular, upper 1/3 ovoid, but contracted sharply beneath the rim, ≤ 5 cm high, ≤ 3.5 cm wide, with two fringed wings (≤ 3 mm wide) running from the rim about 1/3 of the way down the front of the pitcher. Glandular region covers the lower 2/3 of the inner surface. Mouth round, very slightly raised at the rear. Peristome cylindrical in cross section, ≤ 3 mm wide, teeth indistinct. Lid ovate, slightly raised in the centre, no appendages. Spur ≤ 4 mm long, unbranched.
Upper pitchers: ≤ 8 cm high, ≤ 4 cm wide, radically different in shape from the lower ones: the lower parts are tubular to infundibular when viewed from the side, but the pitcher walls are laterally appressed, with almost no gap between them in mature pitchers. Upper half widely infundibular throughout; mouth round and horizontal, peristome cylindrical or involute in cross section, ≤ 4 mm wide, teeth indistinct. Lid narrow and cuneate, no appendages, always reflexed beyond 180°. Wings and fringe elements absent. Spur ≤ 5 mm long, unbranched.
Inflorescence: a short, compact raceme; peduncle ≤ 8 cm, rachis ≤ 10 cm; pedicles ≤ 8 mm, with bracteoles. Sepals oblong-lanceolate, ≤ 3 mm long. Rachis of the female inflorescence usually shorter than the male.
Indumentum: some caducous hairs produced on young parts of the plant. Mature plant parts virtually glabrous, except for the inflorescence, which may be sparsely covered with simple hairs.A

Distribution (General)

Indonesia, Sumatra Barat, Gunung Talamau.A

Habitat

Epiphytic in lower montane forest; epiphytic or terrestrial in stunted upper montane forest; 1800-2700 m a.s.l.A

Bibliography

A. Clarke, C.M. 2001: Nepenthes of Sumatra and Peninsular Malaysia

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Indonesia1917-05-29Bünnemeijer 938BO(2)
Citation: Indonesia, Sumatra, Mt Talamaku (Ophir), alt. 1900 m, 29 May 1917, Bünnemeijer 938.

Specimen summary: BO
Isotype of Nepenthes dubia Danser