Terrestrial climber. Stem terete, up to 9 mm diameter. Leaves lanceolate to elliptic, up to 25 cm long, 3.5–4 cm wide, apex acute; 1–2 longitudinal veins on each side of the midrib; petiole canaliculate, somewhat clasping the stem. Lower pitchers to 10 cm tall; basal third inflated, becoming cylindrical towards the mouth and with slight constriction in the middle; fringed wings 2 mm wide, filaments 2–3 mm long. Upper pitchers are ovoid in the basal third and cylindrical above, expanding rapidly just below the peristome, reaching 18 cm in length by 2.4 cm in width; wings reduced to ribs. Peristome cylindrical to slightly flattened, about 5–7 mm wide, green. Pitcher lid oval to cordate and, as in lower pitchers, heavily domed, 3.8 x 3.2 cm and has a 7–8 mm long, 3 mm high keel on the lower surface; spur is up to 4 mm long. In the wild. Lower and upper pitchers predominantly yellowish-green.
Micheler, M., T. Gronemeyer, A. Wistuba, D. Marwinski, W.Suarez & V.B. Amoroso. 2013. Nepenthes viridis, eine neue Nepenthes-Art von der Insel Dinagat, Philippinen. Das Taublatt 76: 4–14.
Pelser, P.B., J.F. Barcelona, & D.L. Nickrent (eds.). 2011 onwards. Co’s Digital Flora of the Philippines. http://www.philippineplants.org.