Características morfológicas y arquitecturales de las especies de Nothofagus Blume (Fagaceae) del Norte de la Patagonia Argentina

• Main Authors: Barthélémy, Daniel, Puntieri, Javier G., Brion, Cecilia, Raffaele, E., Martino, Javier, Martinez, P.
• Other Authors: BotAnique et BioinforMatique de l'Architecture des Plantes (UMR AMAP), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut National de la Recherche Agronomique (INRA)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Recherche pour le Développement (IRD France-Ouest )-Centre National de la Recherche Scientifique (CNRS), Universidad Nacional del Comahue Neuquén (UNCOMA)
• Format: Article in Journal/Newspaper
• Language: Spanish
• Published: HAL CCSD 1999
• Subjects: Nothofagus; Patagonia; Argentina; [SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics; Phylogenetics and taxonomy; [SDV.EE.ECO]Life Sciences [q-bio]/Ecology; environment/Ecosystems; [SDV.BV.BOT]Life Sciences [q-bio]/Vegetal Biology/Botanics; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; Antarc*; Antarctica
• Online Access: https://hal.inrae.fr/hal-03769587

International audience Morphological and architectural features of Nothofagus antarctica (G. Forster) Oersted, N. dombeyi (Mirb.) Blume, N. pumilio (Poepp. et Endl.) Krasser, N. obliqua (Mirb.) Blume and N. nervosa (Phil.) Dim. et Mil. were studied in their natural habitat. Except for the two leaves following the cotyledons, which may be opposite, leaves are normally alternate and distichously arranged along the stem, although tristichous arrangement is not rare in all species but N. pumilio. The basic structure of a leaf includes a petiolated blade and two stipules; the degree of development of each of these parts depends on the leaf position on the plant. Compared to known related species from the northern hemisphere, buds in Nothofagus spp. have low numbers of cataphylls; this kind of leaf may be absent in terminal buds. A shoot elongated during one growing season may or may not branch in that season, which depends on shoot vigour and shoot-apex persistence. The apex of an annual shoot may persist after shoot elongation but spontaneous apex death is relatively common. Flowers are preformed in the winter bud together with their bearing shoot. Morphological and architectural features of the species of Nothofagus studied here are more similar to those of studied species of Fagus, Alnus and Carpinus than to those of Quercus.