ABSTRACT
A floristic survey of tribe Heliantheae Cass. was carried out in the Paranã River basin, in northeastern Goias and southeastern Tocantins. The study was based on field work and herbarium collections. A taxonomic key and commentaries for taxa and illustrations of diagnostic characteristics are presented. Twenty genera, 49 species, five varieties, and a group of species ('Calea teucriifolia group') are recognized. The most diverse genera are Calea (10 species and the C. teucriifolia group), Bidens (7), and Viguiera (6). Taxa with broad distribution, including ruderal plants, and others restricted to the basin and neighbour areas - Bidens edentula, Calea abbreviata, Ichthiothere connata, and Wedelia souzae, endemic to the Chapada dos Veadeiros, and Dimerostemma bishoppii, endemic the Paranã valley - were recorded.
Key words:
Compositae; Goiás; floristics; Tocantins