Pseudosmilax seisuiensis Hayata, Icon. Pl. Formos. 9: 125. 1920; Heterosmilax hogoensis (Hayata) T. Koyama; P. hogoensis Hayata.

Vines climbing. Stem branched, to 3 m, woody. Petiole 1.5--3 cm, narrowly winged for 1/4--1/5 its length; tendrils well developed. Leaf blade usually becoming yellowish brown when dried, ovate or cordate-ovate, 7--20(--25) × 3.5--15(--18) cm. Male inflorescence: peduncle (4--)5--6 cm, slightly compressed; umbel 50--60-flowered, base thickened, globose, 1.5--3 mm in diam.; pedicels 1--2 cm. Male flowers: perianth oblong or obovoid, 2.5--3 × 1.5--2 mm, teeth obtuse at apex; stamens 9; filaments 2--2.5 mm, connate proximally, forming a column 1--1.5 mm but leaving apices free; anthers lanceolate-ovate, 0.8--1 mm. Female flowers unknown. Berries suboblate-globose, 5--8 × 6--9 mm. Fl. Apr--May, fr. Oct.

* About 1300 m. Taiwan.