Description from Flora of China
Piper arborescens var. angustilimbum Quisumbing; Piper kotoense Yamamoto.
Climbers glabrous except for rachis, dioecious. Stems many ridged, nodes markedly enlarged, glabrous. Petiole 5-10 mm, tuberculate; leaf blade ovate-lanceolate or ovate, 9-13 × 3-6 cm, papery to ± leathery, glabrous, base rounded, usually with a small lobe adnate to and narrower than petioles, ± symmetric, apex caudate with mucro 1-2 cm; veins 5, all basal, abaxially prominent. Spikes leaf-opposed. Male spikes longer than leaf blades; peduncle longer than petioles, glabrous; rachis hispid; bracts orbicular or suborbicular, 0.6-0.9 mm wide, peltate, glabrous, ± sessile. Stamens 2 or 3; anthers reniform. Female spikes ca. 8 cm × 2.5 mm or longer; peduncle and rachis as in male spikes; bracts ± 5-lobed, stalk 0.5-1 mm, pubescent. Ovary globose, base tapered; stigmas 3 or 4. Drupe ellipsoid, 1.5-2 × 0.6-0.8 mm. Fl. Mar-Jun.
Forests. Taiwan [Malaysia, Philippines]