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We review the tribes of Cynipidae that are known to contain gall inducers on herbaceous plants, which are presently classified in four tribes: Aulacideini, Aylacini, Diastrophini, and Phanacidini. We provide a revised key to these tribes, diagnostic characters for each tribe, and an updated key to brachypterous and apterous Cynipoidea including the inclusion of brachyptery in Phanacidini. We propose the replacement name Eubothrus Förster, 1869 for the genus Isocolus Förster, 1869 (Aulacideini) as the latter is a homonym of the trilobite genus Isocolus Angelin, 1854 (Trilobita: Isocolidae). We also provide a checklist of world herb gall wasp species including host plant and geographic distribution data. Overall, we report 166 species of herb gall wasps, finding 96 species in 11 genera in Aulacideini, 6 species in 3 genera in Aylacini, and 39 species in 4 genera in Phanacidini, as well as 25 gall-inducing species in 3 genera in Diastrophini, of which 11 are or probably are associated with herbaceous plants. Online Lucid identification keys and images of all the taxa treated herein are available at: http://www.waspweb.org.