Nepenthes densiflora

Nepenthes densiflora

Synonymy

Nepenthes densiflora Danser in Bull. Jard. Bot. Buitenzorg, sér. 3, 16: 268. 1940 sec. Cheek & Jebb 2001
    • Lectotype: Indonesia, Sumatra, Aceh, Gajo Land, Poe-tjoek Angasan, biv. I to biv. II, alt. 2400 m, 28 Jan 1937, Van Steenis 8331 (BO).
    • Isotype: Indonesia, Sumatra, Aceh, Gajo Land, Poe-tjoek Angasan, biv. I to biv. II, alt. 2400 m, 28 Jan 1937, Van Steenis 8331 (L).
    • Isotype: Indonesia, Sumatra, Aceh, Gajo Land, Poe-tjoek Angasan, biv. I to biv. II, alt. 2400 m, 28 Jan 1937, Van Steenis 8331 (SING).

Other sources

Nepenthes bongso Korth. × Nepenthes pectinata Danser: Danser, B.H. 1928: – Bull. Jard. Bot. Buitenzorg, sér. 3, 9: 274 (as Nepenthes bongso Korth. × Nepenthes pectinata Danser)
Nepenthes bongso Korth. × Nepenthes pectinata Danser: van Steenis, C.G.G.J. 1938: – Tijd. Kon. Aardrijksk. Genootsch. 55: 750, ic. 7 (as Nepenthes bongso Korth. × Nepenthes pectinata Danser)
Jebb, M.H.P. & Cheek, M.R. 1997: A skeletal revision of Nepenthes. – Blumea 42(1): 1-106: 33
Schlauer, J. & Nerz, J. 1994: – Blumea 39: 139-142: 140

Description

Terrestrial climber, to 2.5 m tall. Stems obtusely triangular to quadrangular, 0.2-0.8 cm diam., internodes 1-9 cm long. Leaves thinly coriaceous, sessile, obovate to obovate-lanceolate or slightly spathulate, 3-15 by 1-3.2 cm, apex acute to rounded, base attenuate, clasping the stem for 3/4 of its circumference. Longitudinal nerves 2 or 3 on each side of the midrib in outer 1/2 of blade, innermost arising from base of midrib, fairly conspicuous. Pennate nerves numerous, oblique, ± curving towards margin. Lower pitchers ovoid, c. 10 by 3 cm, fringed wings 3 mm broad, fringe elements c. 5 mm long; mouth oblique, but horizontal in front part; peristome cylindrical at front, 3-5 mm broad, flattened towards lid, and to 18 mm broad, ribs 0.5-1 mm apart, less marked than in upper pitchers, outer edge strongly recurved, entire, inner edge with teeth 3 mm long, increasing to 7 mm long near the lid; lid orbicular, 3-3.5 cm diam., apex rounded, base cordate, lower surface lacking appendages, nectar glands dense over whole surface (rarely absent from the edge), orbicular (rarely transversely elliptic), shallow, pit-like, 0.15-0.4 mm diam., much larger and longitudinally elliptic along the midline, to 1-1.5 mm long; spur simple, ± flattened, to 7 mm long. Upper pitchers broadly to narrowly infundibuliform, somewhat contracted at mouth, 9-23 by 3-4.5 cm, lacking fringed wings; mouth horizontal at front, with peristome rising more or less to the vertical towards lid; peristome cylindrical, 2-4 mm diam. at front, to 11 mm broad near lid, ribs 1-2 mm apart, outer edge entire, inner edge with teeth 3 mm long, otherwise as lower pitcher; lid orbicular to 5.5 cm diam., lower surface lacking appendages, nectar glands dense, largest, c. 1 mm diam., near base of lid. Male inflorescence to 20 cm long, 1.5 cm wide; peduncle 7 cm long, 1 mm diam. at base; partial peduncles 10-20, 1-flowered, rarely 2-flowered, 3-5(-7) mm long; bract 3-4 mm long, inserted at or near base; tepals elliptic, c. 5.5 by 3 mm; androphore c. 3 mm long; anther head c. 1.75 by 3 mm. Fruit valves 15-20 by 5 mm. Seeds fusiform, c. 8 mm long. Indumentum dense on inflorescence, new growth and tendrils, sparse elsewhere. Colour of pitchers pale green, peristome streaked with red; midrib red; indumentum reddish brown.A

Notes

Among the Sumatran species, N. densiflora can only be confused with N. bongso s.l. or N. ovata, which share infundibuliform upper pitchers, which are constricted below the mouth. From N. bongso it differs by the more abrupt origin of the pitcher from the tendril (in the latter the curve of the lower pitcher is broad, and the pitcher widens gradually), the clasping, non-auriculate leaf bases, and the larger lid glands. From N. ovata it differs by its lack of an appendage on the lower surface of the lid. Nepenthes diatas, which occurs in the same area as N. densifloraand which is probably closely related, is distinguished by its ventricose-tubular pitcher, and stiff, almost woody peristome.A
According to Cheek & Jebb 2001, Nepenthes bongso Korth. × Nepenthes pectinata was based on the same type by Danser (1940) B

Distribution (General)

Sumatra: Aceh province (G. Leuser National Park).A

Habitat

Montane scrub; 1700-3000 m.A

Bibliography

A. Cheek, M.R. & Jebb, M.H.P. 2001: Flora Malesiana - Nepenthaceae, Series I, Volume 15
B. Berendsohn, W.G. 2017+: Compilation of Nepenthes data for the Caryophyllales taxonomic backbone.

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Indonesia1937-01-28Van Steenis 8331BO, L, SING
Citation: Indonesia, Sumatra, Aceh, Gajo Land, Poe-tjoek Angasan, biv. I to biv. II, alt. 2400 m, 28 Jan 1937, Van Steenis 8331.

Specimen summary: BO
Lectotype of Nepenthes densiflora Danser Nepenthes bongso Korth. × Nepenthes pectinata Danser

Specimen summary: L
Isotype of Nepenthes densiflora Danser Nepenthes bongso Korth. × Nepenthes pectinata Danser

Specimen summary: SING
Isotype of Nepenthes densiflora Danser Nepenthes bongso Korth. × Nepenthes pectinata Danser