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In the present paper, the author describes a new species of Salvinia, S. herzogii, on Argentine material from Lower Paraná River. It is probable that all specimens of this country determined S. auriculata Aublet, belong to this new species. A key for identification of S. herzogii and related species according to the leaf characters and configuration of the submerged organs is given. [ABSTRACT FROM AUTHOR]

This is the first from a series of papers dealing with the comparative study of all neotropical species of Salvinia. In the first part, the author comments the systematic position of all the species mentioned so far for tropical America. In the second part, the morphology and structure of the sporophyte and its reproductive organs of Salvinia oblongifolia are studied. This species lives in the center-north and NE of Brazil. [ABSTRACT FROM AUTHOR]

In the present paper, the second of the series with started with a study of the sporophyte of S. oblongifolia, the author repords some dates and adds comments of the following aspects of S. auriculata: leaf dimorphism, venation, experiments of decapitation of the submerged organs and the lateral branches; leaf anatomy with the special emphasis on the development air chambers and hair and papilla formation; ramificación of the submerged organs and its significance for the identification of S. auriculata and related species [ABSTRACT FROM AUTHOR]