长梗紫麻 chang geng zi ma

Villebrunea pedunculata Shirai, Bot. Mag. (Tokyo) 9: 160. 1895.

Shrubs or small trees 2-5 m tall; bark dark brown; branches slender, branchlets, and petioles densely appressed pubescent, then glabrescent. Stipules lanceolate, 0.6-1 cm; petiole 1-4 cm; leaf blade abaxially light green, adaxially dark green, narrowly ovate or lanceolate, 5-15 × 1.2-4.5 cm, herbaceous or thinly papery, 3-veined, basal-lateral pair reaching apex, anastomosing with basal pair of secondary veins, secondary veins 2 or 3 pairs, abaxial surface strigillose on prominent veins, adaxial surface sparsely strigillose, then glabrescent, base rounded, obtuse, or rarely broadly cuneate, margin serrulate, apex acuminate to long caudate-acuminate. Inflorescences in axils of last year’s and older branches; female ones dichotomously branched 1 or 2 times, 0.7-1.2 cm; glomerules 2-3 mm in diam. Male flowers: perianth lobes 3, ca. 0.7 mm; rudimentary ovary clavate. Female flowers ca. 1 mm. Achene ovoid, compressed, ca. 1.5 mm, smooth, surrounded by a fleshy discoid cupule at base. Fl. Mar-May, fr. Jun-Oct.

Forest margins, valleys; 100-1200 m. Taiwan [Japan (Ryukyu Islands)].