Abstract
A taxonomic revision of Fernandoa Welw. ex Seem. (Bignoniaceae) in Thailand is presented. Two species, F.adenophylla (Wall. ex G. Don) Steenis and F.collignonii (Dop) Steenis, are enumerated with updated morphological descriptions, illustrations and a taxonomic identification key, together with notes on distributions, distribution maps, habitats and ecology, phenology, conservation assessments, etymology, vernacular names, uses, and specimens examined. The collection of Wallich Cat. 6502A from Myanmar, Ava at G [G00133642] is designated here as the lectotype of F.adenophylla in a second step lectotypification. F.collignonii has a conservation status of Endangered [EN]. The leaf, stem, and wood anatomy and pollen morphology of F.adenophylla are also reported in this study.