A single mature female plant of N. dubia × N. izumiae grows along the summit trail on Mount Talakmau. It produces infundibular upper pitchers that are yellowish-green in colouration.
On the summit trail of Mount Talakmau, a solitary mature female plant of N. dubia × N. izumiae is found. This plant bears funnel-shaped upper pitchers with a yellowish-green hue and can produce many more such pitchers.