En el presente trabajo se describen dos asociaciones: Carduo carpetani-Onopordetum acanthiinov (Onopordeteaacanthii 1964em. Rivas-Martínez in Ladero, F.Navarro C.J. Valle 1983) y Artemisio glutinosae-Santolinetum semidentatae nova (Pegano-Salsoletea Br.-Bl. & O.Molds (1954) 1957 ampl. Peinado E Martínez Parras 1984), aportándose datos corológicos y ecológicos de otras comunidades terofíticas y nitrófilas descritas y que forman parte de la vegetación leonesa.

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We compared the flowering and fruiting phenology of Symphytum tuberosum L. (Boraginaceae), Hyacinthoides non-scripta (L.) Chouard (Liliaceae) and Melittis melissophyllum L. (Labiatae) in a beech wood and an oak wood situated in the same valley, taking into account their different microclimatic and edaphic characteristics and carrying out correlation and simple regression analyses. Differences observed in the phenological cycles of the species studied included earlier flowering and longer cycles in the oak wood, except for H. non-scripta. The most important climatic factors were soil moisture and the relative humidity, followed by temperature and the number of daylight hours and photosynthetically active radiation (P.A.R.). The M. melissophyUum cycle depended mainly on water availability, H. non-scripta on solar radiation, soil moisture and a temperature threshold value, while no specific climatic parameter was found to affect S. tuberosum. Temperature was found to be less important than previously believed as it seems only to correlate with S. tuberosum flowering. The strong correlation observed in the fruiting of the three species indicated clear synchronization.

Se estudian los pastizales duros, abiertos y pobres constituidos por especies vegetales pulvinulares del piso supramediterráneo de ombroclimas subhúmedo y húmedo del Sector Orensano-Sanabriense, incluibles en la alianza Corynephoro-Plantaginion radicatae RivasGoday Rivas-Martínez 1963 nom. invers. Rivas-Martínez 1975, describiéndose la asociación Diantho merinoi-Plantaginetum radicatae nova.

En el presente trabajo se aportan datos corológicos y ecológicos sobre algunas fanerógamas, que se citan por primera vez para la flora leonesa, tales como: Atriplex patula L., Lepidium latifolium L., Lotus tenuis W aldst.EK it. ex W illd. var. tenuis, Hypericum androsaemumL.,Thymus x sennenii Pau, Verbascum blattaria L., Carduus bourgeanus Boiss. E Reuter, Picnomon acarna (L.) Cass., Onopordum nervosum Boiss., Centaurea aspera L. De otras se indican nuevas localidades.