Nepenthes burkei mast.

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Description:
Terrestrial or epiphytic climber. Stems terete, to 0.5 cm diameter. Leaves narrowly oblanceolate-oblong or linear, up to 30 cm long, 3 cm wide, sessile; apex acute to obtuse; base attenuate; longitudinal veins of lamina 4 on each side of the midrib. Lower pitchers up to 16 cm tall, 5 cm wide, with inflated basal parts and wings up to 5 mm wide. Peristome strongly oblique, reddish-brown to bright red, 3 cm wide, ribs 2 mm high, forming narrow, inward protruding teeth 2 mm long. Upper pitchers up to 14 cm tall, 4 cm wide, may be larger, dull green with blotches of red or reddish brown; basal half of pitcher ovoid and swollen, narrowing above and becoming cylindrical towards the mouth; pitcher lid broadly elliptic, 4⎼6 x 3-4 cm, base rounded, apex acute, yellowish-green, with red or orange blotches, lower surface lacking appendages; spur stout, cylindrical, 7⎼10 cm long.

References:
Cheek, M. & M. Jebb. 2001. Nepenthaceae. Flora Malesiana ser. I, vol. 15: 1–157.
Jebb, M. & M. Cheek. 1997. A skeletal revision of Nepenthes (Nepenthaceae). Blumea 42: 1–106.
Kurata, S. & M. Toyoshima. 1972. Philippine species of Nepenthes. Gardens’ Bulletin Singapore 26: 155–158.
Macfarlane, J.M. 1927. The Philippine species of Nepenthes. Philippine Journal of Science 33: 127–140.
McPherson, S. & V.B. Amoroso. 2011. Field Guide to the Pitcher Plants of the Philippines. 60p. Redfern Natural History Productions Ltd., Poole, Dorset, UK.
Pelser, P.B., J.F. Barcelona, & D.L. Nickrent (eds.). 2011 onwards. Co’s Digital Flora of the Philippines. http://www.philippineplants.org.

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