This paper, a survey of Amasonia L.f. from Brazil, was based on field observations and study of herbarium specimens, photographs of the types, besides bibliographic documentation. Amasonia is a neotropical genus, distributed in South America and Antilles. Eight species are recognized here in the genus (A. angustifolia, A. arborea, A. calycina, A. campestris, A. hirta, A. lasiocaulos, A. obovata and A. spruceana) distributed mainly in the Amazon and central-western country. A key to identify the species, illustrations and flowering and fructification periods are provided.
Verbenaceae; Ajugoideae; taxonomy; flora of Brazil
