The roots of plants belonging to the genus Derris, of which more than 80 species have been described. Derris elliptica (Wall.) Benth. and D. malaccensis Prain, Leguminosae are cultivated in British Malaya and the Dutch East Indies. Toxicity data: Haag et al., Proc. Soc. Exp. Biol. Med. 54, 140 (1943).