Contribuição ao estudo da nervação foliar de plantas da flora amazônica. IV - Martinella obovata (H.B.K.) Bur. & K. Schum. e Periarrabidaea truncata A. Samp. (Bignoniaceae).

This paper is the continuation of a catalogue of leaf venation of plants of the Amazonian flora. 2 species of Bignoniaceae are studied. Results indicate the occurence of Hickey's vein pattern camptodromus, subtype eucamptodromus combined with the subtype brochidodromus. For taxonomy of the Bignoniaceae, variations in the vein network allow the separation of taxa. Results are documented by descriptions and by drawings.