Christian A. Zanotti

Sinopsis y novedades taxonómicas de la familia Marantaceae en la Argentina, incluyendo una nueva cita para el Paraguay

A synopsis and taxonomic novelties of the family Marantaceae in Argentina, including a new record from Paraguay. This synopsis of the Argentine species of Marantaceae includes six genera and seven species: Ctenanthe muelleri, Goeppertia eichleri, Maranta sobolifera, Saranthe eichleri, Stromanthe boliviana, Thalia geniculata, and T. multiflora. Species Ctenanthe muelleri is cited for the first time for Argentina and Paraguay, and Saranthe eichleri as a new record for Argentina. Ctenanthe casupoides var. subtropicalis is here synonymyzed within Saranthe eichleri. Lectotypes are designated for Calathea eichleri, C. macrostachya, Saranthe eichleri, and Thalia geniculata. Treatment of each species includes synonyms, iconography, vernacular names, observations, ethnobotany, geographical distribution, and habitat, and examined material. A key to the species, some illustrations and field photographs are also provided.

A New Species of Oxypetalum (Apocynaceae, Asclepiadoideae) from Northern Argentina

Abstract Oxypetalum is the largest genus of Oxypetalinae (Apocynaceae-Asclepiadoideae) and presents its highest diversity in southern South America. A new species, Oxypetalum globosum, from montane environments of northern Argentina, is described, illustrated, and compared to similar species. Data on its habitat, distribution, ecology, and phenology are provided. This is an outstanding species within Oxypetalum due to its flowers with maroon, globose corollas, with patent, rounded corolla lobes, and a bright pink, exserted, hemispheric stylar-head appendage, which suggest fly- pollination. The difficulties in delimiting genera of Oxypetalinae are discussed. A key to the species of Oxypetalum from northern Argentina is included.

El género Galeandra (Orchidaceae) en Argentina

Galeandra (Orchidaceae) comprises about 18 species of epiphytic and terrestrial neotropical herbs. The genus is recognized by its flowers with funnel-shaped lip and spurred at the base. Four species of Galeandra have been recognized for the Argentinean flora in previous taxonomics studies: G. beyrichii, G. graminoides, G. hysterantha and G. styllomysantha. The aim of this contribution was to do a taxonomic treatment of Galeandra for Argentina. We recognize to G. beyrichii and G. xerophila, the last one is a new record for the argentinean flora. Galeandra graminoides and G. stylomisantha, are considered a doubtful report. The treatment includes an identification key, descriptions, geographic distributions data and habitat, field photographs, observations and comments on each species.

Nototriche chaniensis (Malvaceae), una Nueva Especie Poligámica de los Andes de la Argentina

Resumen. Se describe e ilustra a Nototriche chaniensis C. A. Zanotti & J. C. Ospina (Malvaceae), una nueva especie poligámica de los Andes de la Argentina. Nototriche chaniensis es morfológicamente afín a N. agyna Krapov., de la cual se diferencia principalmente por presentar el lóbulo central de la lámina entero, y la vagina y la porción libre del pecíolo de la hoja son de un largo considerablemente menor. Se incluyen la descripción, ilustración y fotos de la especie nueva. Se presenta una clave para diferenciar las especies poligámicas conocidas hasta el momento.

A New Species of Valeriana from the Andean Region of Northwestern Argentina Based on Morphological and Molecular Data

Abstract Valeriana serratifolia, a new species from the Andean region of northwestern Argentina, is described and illustrated. It can be distinguished from its closest morphological taxon, V. macrorhiza, by its entire, spathulate leaves with serrulate margin, and falcate fruits, 2–2.5 mm long, crowned by the reduced annular calyx shifted toward the ventral face. A phylogenetic analysis based on DNA sequences of plastid markers trnL-F and trnK intron supported V. macrorhiza as its closest related species. We also provide a key to differentiate V. serratifolia from the epappose species of Valeriana from Argentina.