The subtribes Ambrosiinae and Helianthinae (Heliantheae - Asteraceae) in the Brazilian Amazon.
The work presents a taxonomic treatment of the subtribes Ambrosiinae and Helianthinae, belonging to the tribe Heliantheae (Asteraceae), in the Brazilian Legal Amazon. We present identification keys, descriptions, detailed illustrations, comments and geographical distribution of the species. Three genera were found in Ambrosiinae, totaling four species and two genera for Helianthinae, adding seven species. Aldama kunthiana and A. grandiflora appear as new records for the state of Tocantins and A. oblongifolia as a new occurrence for Acre. Parthenium hysterophorus was first recorded in the state of Amazonas.