The typification of the names Mesembryanthemum purpurocroceum and M. insititium are discussed. A neotype (illustration by Duncanson) and a lectotype (a specimen at B in Willdenow’s Herbarium) are designated. Epitypes (deposited at BOL) are also selected for both names. Nomenclatural issues about the specific epithet “purpurocroceum” are discussed. The two names are accepted here in Malephora as heterotypic synonyms, with M. purpurocroceum having nomenclatural priority.

As a part of ecologic studies conducted in wetlands of Patagonia, Argentina, and in the frame of taxonomic studies within Chenopodiaceae for South America, we collected specimens of Suaeda that did not match the features to any of the species currently known to the Flora of Argentina. The aim of this contribution is to report for the first time the presence of Suaeda paradoxa in Argentina, by the means of the study of living plants and herbarium material, original descriptions, type material, and complementing with a distribution map, photos, a diagnostic key, and a comparative table to the herbaceous species of Suaeda in Argentina. Also, some comments regarding ecological and distributional features are discussed. This is the first record of S. paradoxa outside its native distribution range.

Introducción y objetivos: El género Matthiola W. T. Aiton posee entre 50 y 60 especies originarias del Mediterráneo, Asia central y Sudáfrica. M. incana (L.) W. T. Aiton, nativa del sur de Europa, se encuentra naturalizada en otras regiones del mundo. En Argentina es cultivada como ornamental. A partir de observaciones florísticas se halló una población naturalizada, que se autoperpetúa sin intervención del hombre, en las costas de la Patagonia Argentina. El objetivo de este trabajo es reportar por primera vez la naturalización de M. incana en Argentina.M&M: Para la identificación de la especie se siguieron los métodos clásicos de taxonomía, se consultó bibliografía específica y se contrastó el material recolectado con imágenes digitales del lectotipo. Se recolectaron semillas de la población naturalizada y se evaluó el poder germinativo a través de un ensayo de germinación. El material recolectado que documenta el presente trabajo fue depositado en el herbario ARC de la Universidad Nacional del Comahue.Resultados: Se describe a Matthiola incana. Se incluyen nombres vulgares y datos sobre distribución, hábitat, ecología y usos. Se presenta una serie de fotografías de campo y bajo microscopio estereoscópico para complementar la descripción. El ensayo de germinación demostró que el 95% de las semillas germina a las 24 hs a 25 °C.Conclusiones: Se reporta por primera vez para Argentina la naturalización de Matthiola incana, única especie del género en el país hasta el momento.

The naturalization of Hibiscus trionum (Malvaceae), a crop weed widely distributed worldwide, is reported for the first time for Argentina. The species is described on the material collected for this study. In addition, its uses, distribution and habitat, common names and a key to differentiate the species of Hibiscus cited for the Flora of Argentina are included. Two figures with photographs that complement the description of the species are presented.

The genus Malephora is native to South Africa. Due to its high adaptability, M. purpurocrocea is the most widespread species of the genus, cultivated as ornamental, in arid and semi-arid environments of the Argentinean Patagonia. In this contribution, several spontaneous populations of M. purpurocrocea are reported for the first time for Argentina. The species was observed and collected in different environments in the provinces of Neuquén, Río Negro, and Chubut. A detailed description of the species, distribution and habitat, common names, uses, and a key to the genera of Aizoaceae present in Argentina are included. Due to the lack of detailed studies on the morphology of this species, a series of field photographs and details of microscopic structures are also presented.