Smilax elongatoreticulata Hayata; S. elongatoumbellata f. elongatoreticulata (Hayata) T. Koyama.

Plants shrubby, suberect to scandent. Stem and branches scarcely or sparsely prickly. Petiole 5--8 mm, narrowly winged for ca. 2/3 its length; abscission zone distal; tendrils usually present. Leaf blade abaxially glaucous, ovate-elliptic to oblong-lanceolate, 2.5--9 × 1--4 cm, main veins (3--)5, prominent on both sides. Inflorescence borne in axil of proximal leaf, of 1 umbel, basally not prophyllate; peduncle 1--4 cm; umbels of both sexes 9--28-flowered. Male flowers: outer tepals ca. 6.5 × 3 mm, inner ones ca. 1/2 as wide as outer ones. Female flowers: tepals smaller than male ones. Berries blackish, globose, 6--8 mm in diam., white powdery. Fl. Mar.

1300--1500 m. Taiwan [Japan (Ryukyu Islands)].