Nepenthes neoguineensis has a very sparse indumentum. The stem is virtually glabrous, as is the lamina. Tendrils are densely hirsute when young, becoming only hairy near the pitcher or entirely glabrous when mature. Pitchers have a dense covering of caducous stellate hairs. The exception is the spur, which has persistent stellate hairs. Inflorescences have a very dense indumentum of short, white or brownish stellate hairs. The pedicels, tepals and the ovary are very densely stellate-tomentose.
