Abstract It is presented the first taxonomic study of the tribe Coreopsideae (Asteraceae) in Northeastern Brazil. A total of seven genera and 16 species were recorded in the region, with Bidens being the richest genus (8 spp.). Bidens tenera and Cosmos bipinnatus were recorded for the first time to the region, and Heterosperma ovatifolium represents the first record to Brazil. Bidens, Chrysanthellum, and Dahlia are taxonomically problematic that is reflected by several misidentifications found in the herbaria collections. Coreopsis, Cosmos, and Dahlia species are cultivated as ornamental but are scarcely represented in the herbaria. This study provides a checklist, an identification key to all species, in addition to discussing the importance of studying alien species for a better understanding of the Brazilian flora.

Resumo Como resultado dos nossos estudos em Coreopsideae no Nordeste do Brasil, apresentamos o primeiro registro de Heterosperma (H. ovatifolium) para o País. O gênero atualmente é composto de 11 espécies com distribuição do sudoeste dos Estados Unidos até a América do Sul, incluindo a região do Caribe. Neste trabalho apresentamos uma descrição completa, imagens, e um mapa com a distribuição atualizada da espécie, além de uma chave de identificação atualizada para os gêneros de Coreopsideae para o Brasil.

Abstract We present the first record of Heterosperma (H. ovatifolium, Asteraceae) for Brazil as a result of the taxonomic study of tribe Coreopsideae for Northeastern Brazil. The genus currently comprises 11 species, occurring from southwestern United States to South America and the West Indies. We present a complete morphological description, a photo plate, and a distribution map with the updated distribution for H. ovatifolium. Additionally, we present an updated identification key for the genera of Coreopsideae for Brazil.