- Scientific Name: Kerria japonica (L.) DC.
- Ref: Trans. Linn. Soc. London 12:157. 1818
- Synonyms: Corchorus japonicus (L.) Thunb.; Kerria japonica var. denticulata L.C.Wang & X.G.Sun; K. japonica f. semiplena Hayashi; Rubus japonicus L.; Spiraea japonica (L.) Desv.
- English Common Name: kerria
- Chinese Common Name: 棣棠花 dìtáng∙huā, 鸡蛋黄花 jīdàn∙huáng huā
- Japanese Common Name: ヤマブキ [山吹] yamabuki
- Family: Rosaceae
- Genus: Kerria
- Distribution: Thickets on mountain slopes; 200–3000 m. Anhui, Fujian, Gansu, Guizhou, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Shandong, Sichuan, Yunnan, Zhejiang [Japan].
Shrubs 1–2(–3) m tall. Branchlets green, usually arcuate, terete, angled when young, glabrous. Stipules deciduous after flowering, oblong-lanceolate, membranous, margin ciliate; petiole 5–15 mm, glabrous; leaf blade triangular-ovate or ovate, 3–10 × 2–4 cm, abaxially pilose on veins or in vein axils, adaxially glabrous or sparsely pilose, base subcordate, rounded, or truncate, margin sharply doubly serrate, apex acuminate. Flowers 2.5–6 cm in diam.; pedicel 8–15 mm, glabrous. Sepals persistent in fruit, ovate-elliptic, glabrous, margin serrulate or entire, apex rounded to acute. Petals broadly elliptic, 1.5–2 × 1–1.8 cm, 1–4 × as long as sepals, apex emarginate. Achenes brownish black, obovoid or hemispheric, 4–4.5 × 3.5–4 mm, rugose. Fl. Apr–Jun, fr. Jun–Aug. 2n = 18. (Flora of China)
