"Nepenthes benstonei" has a racemose inflorescence. The peduncle is up to 20 cm long and the rachis up to 30 cm long. The first flower is generally borne on a pedicel, sometimes with a simple, lanceolate bracteole (≤1.5 cm long). Subsequent flowers are produced on pedicels or two-flowered partial peduncles, which lack bracteoles. Sepals are ovate and around 4 mm long. Male inflorescences usually bear around twice as many flowers as female ones. "N. benstonei" is one of the few "Nepenthes" species known to produce multiple inflorescences concurrently on a single stem. Two to three are usually produced, originating from sequential nodes at the top of the stem. This unusual reproductive habit has also been observed, although much more rarely, in "N. alba", "N. ampullaria", "N. attenboroughii", "N. rigidifolia", "N. sanguinea", and "N. thai". It is seen even more frequently in "N. philippinensis".