Nepenthes eustachya

Nepenthes eustachya


Nepenthes eustachya Miq., Fl. Ned. Ind. 1(1): 1074, suppl. 151. 1858 sec. Cheek & Jebb 2001
    • Isotype: Indonesia, Sumatra, Sibolga, on the coast, Feb 1856, Teijsmann 529 (BO)
    • Lectotype: Indonesia, Sumatra, Sibolga, on the coast, Feb 1856, Teijsmann 529 (BO)

Other sources

Hooker, J.D. 1873 – In: de Candolle, A. L. P. P., Prodromus 17. – Paris: Masson: 99
Macfarlane, J. M. 1908: pp. 1-92. – In: Engler, A., Pflanzenreich IV. 111 (Heft 36): 51
Jebb, M. H. P. & Cheek, M. R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106: 38
Beck von Mannagetta und Lerchenau, G. 1895: Die Gattung Nepenthes. – Wiener Ill. Gart.-Zeitung 20: 96-107, 141-150, 182-192, 217-229: 217
Miquel, F. A. W. 1870: – Ill. Fl. l’Arch. Ind. 1: 3, pl. 3


Terrestrial climber to 5 m tall. Stem terete, 0.3-0.7 cm diam., internodes of climbing stems 1-6.5 cm long. Leaves chartaceous, petiolate, leaves of climbing stems obovate to oblong-lanceolate, 14-19.5 by 2.9-5 cm, apex rounded, sub-peltate, or slightly emarginate, base tapering to winged; petiole c. 5 by 0.7 cm wide, broadening at very base, and clasping stem for 1/2 its circumference, not decurrent or auriculate. Longitudinal nerves 2 or 3 (or 4) on each side of the midrib, some arising from midrib base, confined to outer 1/2-1/3 fairly conspicuous. Pennate nerves arising obliquely from the midrib at an angle of c. 30°. Lower pitchers not seen. Upper pitchers ventricose-tubular, widening abruptly from base, and somewhat woody and angular there, becoming obovoid, then narrowing and gradually enlarging towards the mouth, 11-24.5 by 2.5-4.5 cm, normally lacking wings, but rarely with fringed wings to 0.3 cm wide, the fringe elements to 0.4 cm long; mouth oblique, more or less straight, attenuate to lid; peristome rounded to slightly flattened in cross section, 0.2-0.5(-0.7) cm wide, ribs 0.3-0.4 mm apart, outer edge entire, inner with no teeth apparent; lid obovate to orbicular, rarely somewhat broader than long, base rounded to scarcely cordate, 3-6.5 by 2.5-6.7 cm, lower surface lacking an appendage or keel, nectar glands orbicular, not prominently bordered, 0.1-0.15 mm diam., scattered, densest near base; spur 2-4 mm long, usually bifid, occasionally with ancillary hair-like appendages arising from near base, rarely simple, flattened to 10 mm long. Male inflorescence 50 by 2.5 cm; 15 cm long, 5 mm diam. at base; partial peduncles diffuse, c. 25, 2-flowered near base of inflorescence, 1-flowered above, 4-5 mm long; bracts absent; pedicels 10-23 mm long; tepals lanceolate, 3.5-4 by 2-2.5 mm; androphore 2.5-3 mm long; anther head 1 by 1.5 mm. Fruit valves to 17 by 2.3 mm. Seeds unknown. Indumentum sparse, evanescent, most conspicuous on upper surface of midrib, 0.4 mm long, simple, brown and on pitchers below peristome c. 0.2 mm long, branched, dull yellow. Colour of pitchers green.A


Danser in Bull. Jard. Bot. Buitenzorg III 9 (1928) 259 united N. eustachya with N. alata Blanco of the Philippines. The two species differ most conspicuously in the presence of a lid appendage in N. alata.
Danser in Bull. Jard. Bot. Buitenzorg III 9 (1928) 261 included Peninsular Malaysia in the range of what he treated as N. alata (which also included N. eustachya) on the basis of a single misidentified specimen of N. gracillima (Ridley 16097) from Mt Tahan (Kiew J. Wildlife and National Parks (Malaysia) 10 (1990) 34-37).A

Distribution (General)

Sumatra: from Lake Toba in the north to the Padang region in the southA


Forest margins; sea level to 1600 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


CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Indonesia1856-02Teijsmann 529BO(2)
Citation: Indonesia, Sumatra, Sibolga, on the coast, Feb 1856, Teijsmann 529

Specimen summary: BO
Isotype of Nepenthes eustachya Miq.