• Scientific Name: Eucommia ulmoides Oliv.
• Ref: Hooker’s Icon. Pl. 20:t.1950. 1890
• English Common Name: hardy rubber tree
• Chinese Common Name: 杜仲 dùzhòng
• Japanese Common Name: トチュウ [杜仲] tochū
• Family: Eucommiaceae
• Genus: Eucommia
• Distribution: Mixed forests, sparse forests, thickets, lower mountains, ridges, valleys, dry ravines, fields, also widely cultivated and locally becoming naturalized; 100–2000 m. Gansu, Guizhou, Henan, Hubei, Hunan, Shaanxi, Sichuan, Yunnan, Zhejiang; cultivated in Anhui and Beijing.
• Photo: 05/03/2013

Trees to 20 m tall. Trunk to 50 cm d.b.h.; bark gray-brown, scabrous. Young branches yellow-brown pubescent at first, soon glabrate, old ones conspicuously lenticellate. Buds shiny red-brown; scales 6–8, margin puberulous. Petiole 1–2.5 cm, sparsely villous; leaf blade pale green adaxially when old, 5–15 × 2.5–7 cm, brown pubescent at first, later pubescent only along veins, lateral veins 6–9-paired, together with reticulate veins slightly prominent abaxially, concave adaxially. Male flowers: stamens ca. 1 cm, glabrous, filaments ca. 1 mm. Female flower: ovary ca. 1 cm, glabrous. Samara 2.5–3.5 × 1–1.3 cm; stipe 2–5 mm, articulate at 1–3 mm pedicel. Seed 1.3–1.5 cm × ca. 3 mm. Fl. Mar–May, fr. Jun–Nov. (Flora of China)

03/27/2015, Zijingang Campus, Zhejiang University