4. Paraderris elliptica (Wallich) Adema, Thai Forest Bull., Bot. 28: 11. 2001.
毛鱼藤 mao yu teng
Pongamia elliptica Wallich, Pl. Asiat. Rar. 3: 20. 1832; Derris elliptica (Roxburgh) Bentham; Galedupa elliptica (Wallich) Roxburgh.
Lianas, 7-10 m, robust. Young branchlets, leaf rachises, petioles, and petiolules densely brown pubescent. Branches glabrous when old, scattered with brown lenticels. Leaves 9-13-foliolate; rachis 20-35 cm, including petiole 4-8 cm; leaflet blades oblong, obovate-oblong, or oblanceolate, 6-15 × 2-4 cm, thickly papery, abaxially greenish white and finely brown sericeous, adaxially glabrous or only pubescent along veins, base cuneate to broadly cuneate, apex shortly obtusely acuminate. Pseudoracemes axillary, 15-25 cm, rachis densely pubescent; rachis nodes with 3 or 4 flowers fascicled on short branchlets; peduncle 8-12 cm or much longer, densely pubescent. Pedicel 6-8 mm, densely pubescent. Flowers ca. 2 cm. Calyx shallowly cup-shaped, ca. 4 × 6-7 mm, densely sericeous. Corolla pink to whitish, 1.5-1.8 cm; standard suborbicular, 1.2-1.5 cm wide, outside brown pubescent, apex emarginate. Ovary densely pubescent. Legume oblong, 3.5-8 × 1.7-2 cm, compressed, pubescent when young, glabrescent; abaxial suture with a ca. 0.5 mm wide wing, adaxial suture with a ca. 2 mm wide wing. Seeds 1-4 per legume. Fl. Apr-May, fr. Jun.
Cultivated in Guangdong, Guangxi, Hainan, Taiwan, and Yunnan [native to Cambodia, India, Indonesia, Laos, Malaysia, Philippines, Thailand, and Vietnam].
This species is cultivated for use as an insecticide.