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FOC | Family List | FOC Vol. 10 | Fabaceae | Derris

11. Derris tonkinensis Gagnepain, Notul. Syst. (Paris). 2: 349. 1913.

东京鱼藤 dong jing yu teng

Trees or climbing shrubs. Branches brown to red, gla­brous. Leaves 5(or 7)-foliolate; rachis 4-8 cm, including petiole 1.5-6 cm; leaflet blades ovate-lanceolate or broadly ovate to ovate-oblong, 3-10 × 1.5-4 cm, firm in texture, glabrous, base rounded but apical one cuneate, apex shortly acuminate to ob­tuse. Pseudoracemes axillary or terminal, lax or somewhat con­gested, 7-10 × ca. 5 cm, sometimes paniculate with 1 to many 3-4 cm slender branches, thinly reddish pilose; rachis nodes with 4-6 flowers congested and fascicled or lax and borne on 1.5-2 cm branchlets. Pedicel 6-7 mm, appressed reddish pilose. Flowers 1-1.2 cm. Calyx cup-shaped, 2.5-3 mm, appressed reddish pilose; teeth obscure. Corolla whitish to pink; petals all clawed; standard elliptic, 10-12 × ca. 6 mm, reflexed, base abruptly attenuate. Ovary slightly pilose. Legume ellipsoid, 8-11 × ca. 2.5 cm, flat, glabrous, finely veined, both ends obtusely attenuate; abaxial suture with a 1-2 mm wide wing, adaxial suture with a ca. 5 mm wide wing. Seed 1(or 2) per legume. Fl. Mar-Jun, fr. May-Nov.

Scrub or sparse forests on mountain slopes. Guangdong, Guangxi, Guizhou [Vietnam].

1 Leaves 5-foliolate; leaflet blades ovate-lanceolate, 3-6 cm; inflorescences with 1-3 or more branches; flowers lax on 1.5-2 cm branchlets.   11a var. tonkinensis
+ Leaves 5(or 7)-foliolate; leaflet blades broadly ovate to ovate-oblong, 5-10 cm; inflorescences with many branches; flowers congested and fascicled.   11b var. compacta

Lower Taxa


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