Dues noves comunitats de Thero-Brachypodion a les Terres Catalanes Authors Carme Casas i Arcarons Roser Guàrdia Rúbies Josep Maria Ninot i Sugranyes Abstract Two new therophytic populations are described: Clypeolo-Psiluretum and Brachypodio- Stipetum euphrasio-centaurietosum. The former settles on the most superficial soils on calcareous hills of the Noguera country, an area bearing a rather continental dry Mediterranean climate; it is a pasture almost completely built by small annual plants, with a short spring period of main activity, ending in june. According to its floristic features, as well as to its structure and behaviour, it is related to the continental Iberian sub-alliance Asterisco-Velezienion. The other community grows in a. sub-Mediterranean area around Vic-, under a moister and colder general climate, but also on superficial calcareous soils. In this case, the therophytes are accompanied by several cespitose and chamaephytic plants, but no perennial grass has a general dominance. Although owning some floristic particularities, this new community can be related to (as a new sub-association) the Brachypodio-Stipetum, a previously known grassland in which Stipa Iberica usually covers most of the surface, allowing to grow only a few therophytes. Downloads Download data is not yet available. Downloads Text complet (Català) Published 2005-06-03 Issue Vol. 57 : 1989 (Secció de Botànica, 7) Section Articles License The intellectual property of articles belongs to the respective authors.On submitting articles for publication to the journal Butlletí de la Institució Catalana d'Història Natural authors accept the following terms:Authors assign to Institució de la Societat Catalana d’Història Natural (a subsidiary of Institut d’Estudis Catalans) the rights of reproduction, communication to the public and distribution of the articles submitted for publication to Butlletí de la Institució Catalana d'Història Natural.Authors answer to Institució de la Societat Catalana d’Història Natural for the authorship and originality of submitted articles.Authors are responsible for obtaining permission for the reproduction of all graphic material included in articles.Institució de la Societat Catalana d’Història Natural declines all liability for the possible infringement of intellectual property rights by authors.The contents published in the journal, unless otherwise stated in the text or in the graphic material, are subject to a Creative Commons Attribution-NonCommercial-NoDerivs (by-nc-nd) 3.0 Spain licence, the complete text of which may be found at https://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.en. Consequently, the general public is authorised to reproduce, distribute and communicate the work, provided that its authorship and the body publishing it are acknowledged, and that no commercial use and no derivative works are made of it.The journal Butlletí de la Institució Catalana d'Història Natural is not responsible for the ideas and opinions expressed by the authors of the published articles.