Continuing the Project Leguminosae from the Brazilian Amazon, which aims to study the genera of the Amazon. In this work we will study the genus Martiodendron Gleas, represented by only three species: M. excelsum (Benth) Gleason, M. parviflorum (Amsh.) Koeppen, M. elatum (Ducke) Gleason and two varieties within the species M. elatum (Ducke) Gleason, variety elatum and variety occidentale (Ducke) Koeppen. The genus is characterized by beautiful trees, with imparipinnate leaves; leaflets 5-11(13), alternate, ovate or elliptic; panicles at the end of the branches, with showy, yellow flowers; flattened oblique fruit, reniform or subromboid. We highlight information related to pollen morphology, where the genus under study is stenopaline; pollen grains medium, 3-collared, prolate, spheroidal, triangular ambulate with the exception of M. elatum (Ducke) Gleason var. occidentale and M. parviflorum (Amsh) Koeppen.
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