Notes florístiques

Exposition of the more interesting floristic results obtained in botanical excursions, that took place during last years, concerning particularly to Conca de Barbera, in the North part of the province of Tarragona . It's interesting to remark the finding of the second know Catalonian locality of Orchis purpurea Huds. and the finding of Arenaria modesta Duf. var. modesta, 80 Km. far from this preceding records. Some new extreme localities are also pointed out for the Catalonian area of Orchis longibracteata Biv., and Euphorbia nevadensis Boiss. et Reut. subsp. aragonensis (Loscos et Pardo ) 0. Bolòs et Vigo var. aragonensis (Loscos et Pardo) 0. Bolòs et Vigo, and Alyssum lapeyrousianum Jord. var. angustifolium (Willk.) 0. Bolòs et Vigo, etc. In all cases, the localization is indicated according U.T.M. grid

Notes sobre flora al·lòctona

The authors present some additions to synanthropic flora of the Catalonian countries. Several considerations about the distribution, origine, migration and phytocoenological adscription of certain species are also given

Dues Localitats catalanes de "Cenchrus incertus" M. A. Curtis, gramínia nova per a la Península Ibèrica

Two records from Catalonia of an American grass (Cenchrus incertus M. A. Curtis) are reported. They are the first Iberian records and, probably, the first European records too

Syntaxonomic conspectus of the vegetation of Catalonia and Andorra. II: Ruderal communities

This paper deals with plant communities settling on ruderalized sites, such as crop fields, edges of roads or paths, forest clearings, river banks, and other disturbed areas. We report all the phytosociological associations and subassociations recorded from Catalonia and Andorra, as the second part of a general vegetation survey, started with Ninot et al. (2000). For each community, we provide the correct name and usual synonyms, its typification (where appropriate), all the references including relevés, and the most outstanding features of its structure, species composition, ecology, distribution and diversity. Moreover, associations and subassociations are ordered in a syntaxonomic scheme. Syntaxonomic ranks are considered in a fairly broad, conservative sense. This classification established 156 associations and 6 informal community types, which correspond to the classes Oryzetea sativae, Stellarietea mediae, Sisymbrietea officinalis, Artemisietea vulgaris, Cakiletea maritimae, Saginetea maritimae, Pegano-Salsoletea vermiculatae, Bidentetea tripartitae, Polygono-Poetea annuae, Rudero-Manihotetea utilissimae and Epilobietea angustifolii. Complementarily, we propose corrections of names when appropriate, and eventually formalize the description of a few syntaxa