"Nepenthes ×bauensis" is intermediate in appearance between its two parent species. It displays the clumping habit and vine growth of "N. gracilis", but can be distinguished from that species on the basis of its larger leaves and stems. The influence of "N. northiana" is most obvious in the pitcher morphology. In particular, the peristome is wider than in "N. gracilis" and has scattered red bands. Pitchers are up to 15 cm high and may be pale green to purplish-red in colour.