| Summary: | Abstract A taxonomic treatment for Boraginales (Boraginaceae s.l.) and Lamiales (Lamiaceae and Verbenaceae) in the Engenheiro Avidos Ecological Park, a full-protection reserve located in the semiarid region of Paraíba State in northeastern Brazil is presented in this study. At the Park, a total of 22 species were encountered, including nine species of Boraginaceae s.l., six species of Lamiaceae, and seven species of Verbenaceae. Vitex orinocensis (Lamiaceae) was found for the first time for Caatinga and also represents a new record for Paraíba state. Morphological descriptions, keys for separating the families and respective species; data concerning flowering, fruiting, geographic distributions, and of the preferred habitats of the species found in the study area are also provided.
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