Piper polysyphonum C. DC.

Subshrubs erect, to more than 1 m high, glabrous except for a few hairs at bases of flowers, dioecious. Stems black when dry; nodes prominent. Petiole ca. 1 cm; prophyll ca. 2/3 as long as petiole; leaf blade elliptic or broadly elliptic, 11-19 × 4-9 cm, papery, glandular, often ± reddish adaxially when dry, base shortly tapered or subcuneate, rarely rounded, usually symmetric, apex shortly acuminate and mucronate; veins 5-7, apical pair arising 2.5-5 cm above base, alternate, reaching leaf apex, others ± basal; reticulate veins prominent, transversely oblong. Spikes leaf-opposed. Male spikes 7-9 cm × ca. 2 mm; peduncle slightly longer than petioles; bracts obovate-oblong, ca. 1.8 × 0.7 mm, adnate to rachis, margin and apex free. Stamens 3; filaments ca. as long as anthers, sometimes much longer; anthers ovoid. Female spikes 7-11 cm, to 17 cm in fruit; peduncle and rachis as in male spikes; bracts oblong, 3.5-4 × 1.1-1.3 mm. Ovary ovoid, distinct; stigmas 3 or 4, ovate, apex acuminate. Drupe drying black, ovoid, 3-3.5 mm in diam., tuberculate, apex ± subacute, sessile. Fl. Apr-Jun.

SW Guizhou, S Yunnan [Laos]

Wet places within forests; 800-1400 m.

Piper mekongense C. de Candolle.

Piper polysyphonum là một loài thực vật có hoa trong họ Hồ tiêu. Loài này được C. DC. miêu tả khoa học đầu tiên năm 1904.