• Scientific Name: Stemona japonica (Blume) Miq.
• Ref: Prol. Fl. Jap.:386. 1867
• Synonyms: Helwingia argyi H.Lév. & Vaniot; Roxburghia japonica Blume; Stemona argyi (H.Lév. & Vaniot) H.Lév.; S. ovata Nakai
• Chinese Common Name: 百部 bǎibù, 蔓生百部 mànshēng bǎibù
• Japanese Common Name: ビャクブ [百部] byakubu
• Family: Stemonaceae
• Genus: Stemona
• Distribution: Hillsides, densely grassy roadsides; 300–400 m. Anhui, Fujian, Hubei, Jiangsu, Jiangxi, Zhejiang [?Japan].
• Photo: 06/09/2016, Hangzhou, Zhejiang

Vines. Roots 1--1.5 cm thick. Stems erect, base woody. Leaves whorled; petiole 1--4 cm, slender; leaf blade ovate, ovate-lanceolate, or ovate-oblong, 4--9(--11) × 1.5--4.5 cm, veins 5--9, base subtruncate to rounded, rarely rounded-cordate or cuneate, margin slightly undulate, apex acuminate. Inflorescences cymes, 1- to several flowered; peduncle or pedicel borne on leaf midvein, 0.5--4 cm, slender; bracts narrowly lanceolate, ca. 3 mm. Perianth segments green, lanceolate, 10--15 × 2--3 mm, margin revolute. Stamens purple, slightly shorter than perianth; filaments ca. 1 mm, stout; anthers 2--2.5 mm; appendages adherent, with a silky hair on either side, adaxial one ca. 2 mm. Capsule oblong, 10--14 × 4--8 mm, often 2- or 3-seeded, apex obtuse. Fl. May--Jul. (Flora of China)