Piper infossibaccatum A. Huang

The protologue compared this species with Piper hancei but the infructescence is very similar to that of P. austrosinense.

Climbers to 10 m, glabrous throughout, dioecious. Stems slender, nodes swollen, internodes 6-10 cm. Petiole 5-10 mm; leaf blade ovate, 6-10 × 2-4 cm, rigidly papery, base cuneate, symmetric or slightly oblique, apex acute to ± acuminate; veins 5, apical pair arising 1-2 cm above base, alternate, others basal; reticulate veins conspicuous. Spikes leaf-opposed. Male spikes 2-5 cm × ca. 2 mm; peduncle 2-3 × as long as petiole; bracts orbicular or suborbicular, ca. 1.5 mm wide, peltate, subsessile. Stamens 2; filaments very short. Female spikes 1.5-3 cm × ca. 2 mm; peduncle 1.5-3 cm, slender, bracts as in male spikes. Ovary immersed in and connate to rachis; stigmas 3. Drupe globose, 2.5-3 mm, partly connate to rachis.

Hainan

* 700-1100 m.