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Continuing with the series of publications on the flora of the province of Soria (Spain) that precedes the review and reedition of the Floristic Catalogue of Soria (SEGURA & al., 2000), 25 taxa are incorporated, corresponding to vascular plants, which had not previously been recorded. A part of them are neophyte species from America or southern Africa that have recently appeared; others are weed, ruderal or road flora of paleotempered origin (Latecircunmediterranean Iranoturanian). All of them provide with an enlargement of their known distribution area, or with an improvement in the knowledge of their means and paths of expansion. The recent creation of big communication infrastructures such as highways or high-speed trains, or the development of a matted net of interregional and international markets of forest or agricultural products, together with climatic change, have facilitated the progress and genetic flux of neophyte or ruderal species between geographically distant areas. In the province of Soria, such arrival of new species that is facilitated by climatic change is more evident in zones of climatic transition of the iberoatlantic area, and between the mesomediterranean and supramediterranean levels.

We initiate a series of publications on the flora of the province of Soria, Spain, which are previous to the review and reedition of the Floristic Catalogue of Soria (SEGURA & al., 2000), to incorporate 50 taxa corresponding to vascular plants which had not previously been recorded for the flora of province of Soria. Since the level of prospection in the Province is currently very high, these recent findings are all rare and scarce taxa in the province?s territorial context; some are peripheral or much localized, others are restricted to scarce environments and require them to be well preserved; in general, they show a presence extent very diffuse or fragmented in the Province. Another part are taxa recently described, commonly of a sub specific rank. All of them provide with an enlargement of their known distribution area, or with an improvement in their demarcation. Some floristic rarities and some regional novelties stand out, such as Beta maritima, Hippocrepis bourgaei or Lappula patula, besides other species that are very scarce, peripheral, relict or showing a fragmented area of distribution in the Province, such as Arbutus unedo, Hieracium prenanthoides, Gagea foliosa subsp. durieui or Hyacinthoides non-scripta.

Here we present 5 taxa from Orobancheceae family which had not previously been recorded for Soria province, such as Orobanche cernua, Orobanche hederae, Orobanche santolinae, Phelipanche nana and Phelipanche lavandulaceoides. All of these records either enlarge previously known distribution areas, or improve their delimitations.

Se aporta una nueva localidad de Coronopus navasii Pau (Brassicaceae), situada en el páramo de Layna, provincia de Soria, en el extremo noroeste del Sistema Ibérico, España. Esta localidad es actualmente la más septentrional de las conocidas. Se discute la potencialidad de su hábitat en el Páramo de Layna y sus perspectivas de futuro a la luz de los últimos trabajos de campo y publicaciones sobre esta especie. First citation of Coronopus navasii Pau (Brassicaceae) for the province of Soria. Here we provide with new data concerning the presence of Coronopus navasii Pau (Brassicaceae) at Páramo de Layna, Soria province, at the northwestern extreme of the Iberian System, Spain. This is currently the northernmost locality known for the species. The potential of its habitat at Páramo de Layna is discussed to the light of recent field works and studies on the species

Se presentan 39 taxones correspondientes a plantas vasculares raras no mencionadas previamente en el catálogo florístico de la provincia de Soria, como Apium inundatum, Camphorosma monspeliaca subsp. monspeliaca, Colchicum triphyllum, Crupina crupinastrum, Blakstonia imperfoliata, Isoetes setaceum, Helianthemum marifolium, Najas marina, etc. Seis de ellos constituyen una novedad para la flora de Castilla y León, tales como Centaurea boissieri subsp. pinae, Colchicum triphyllum, Erysimum ruscinonesis Gypsophila pilosa y Helianthemum mariifolium. Algunos son muy escasos en el territorio de Castilla y León o incluso en la Península Ibérica, y se encuentran amenazados o protegidos. Para todos ellos se aporta una ampliación de su área de distribución conocida o una mejora en su demarcación. Additions to the Floristic Catalogue of the Province of Soria (Spain), III: Chorologic extensions at the Iberian System and Ebro Valley. Here we present 39 taxa corresponding to rare vascular plants which had not previously been recorded for Soria province, such as Apium inundatum, Camphorosma monspeliaca subsp. monspeliaca, , Colchicum triphyllum, Crupina crupinastrum, Blackstonia imperfoliata, Isoetes setaceum, Helianthemum marifolium, Najas marina, etc. Six out of these aforementioned ones, mean a novelty for the flora of Castilla y León region, such as Centaurea boissieri subsp. pinae, Colchicum triphyllum, Erysimum ruscinonesis, Gypsophila pilosa, and Helianthemum mariifolium. Some of them are very scarce in Castilla y León region or even in the Iberian Peninsula, and are threatened or protected. For all of them enlarge previously known distribution areas are enlarged or their delimitations are improved.

Se aportan cuatro nuevas localidades españolas para dos especies del género Filago L. (Gnaphaliaea: Asteraceae) poco frecuentes en la mitad septentrional de la Península Ibérica: Filago crocidion (Pomel) Chrtek & Holub y F. congesta Guss. ex DC. Tres de estas localidades corresponden a las primeras citas de F. crocidion en las comunidades autónomas de Castilla y León (So) y Aragón (Te). También se aporta la primera cita de F. congesta para la comunidad autónoma de Castilla y León (So). Four new Iberian localities for two species of the genus Filago L. (Gnaphaliaea: Asteraceae) are provided in this work: Filago crocidion (Pomel) Chrtek & Holub and F. congesta Guss. ex DC. Three of these new localities are first citations of F. crocidion at the regions of Castilla y Le- ón (So) and Aragón (Te). In addition, we provide with the first report of F. congesta for the region of Castilla y León (So).

[EN]New citations of the genus Filago at the autonomous communities of Castilla y León and Aragón, Spain. Four new Iberian localities for two species of the genus Filago L. (Gnaphaliaea: Asteraceae) are provided in this work: Filago crocidion (Pomel) Chrtek & Holub and F. congesta Guss. ex DC. Three of these new localities are first citations of F. crocidion at the regions of Castilla y León (So) and Aragón (Te). In addition, we provide with the first report of F. congesta for the region of Castilla y León (So)., [ES] Se aportan cuatro nuevas localidades españolas para dos especies del género Filago L. (Gnaphaliaea: Asteraceae) poco frecuentes en la mitad septentrional de la Península Ibérica: Filago crocidion (Pomel) Chrtek & Holub y F. congesta Guss. ex DC. Tres de estas localidades corresponden a las primeras citas de F. crocidion en las comunidades autónomas de Castilla y León (So) y Aragón (Te). También se aporta la primera cita de F. congesta para la comunidad autónoma de Castilla y León (So).

Se adjuntan algunas novedades de la familia Orchidaceae correspondientes a la provincia de Soria. De ellas 11 son especies no citadas antes (o citadas erróneamente), entre las que destacan: Dactylorhiza incarnata, Epipactis distans, Limodorum trabutianum, Orchis palustris, Orchis papilionacea y Platanthera algeriensis, algunas de ellas muy escasas en la Península Ibérica y todas interesantes desde el punto de vista biogeográfico.

Se mencionan 104 taxones con citas y/o comentarios referidos a su existencia en la provincia de Burgos. De ellos, 36 suponen una novedad para el catálogo provincial. 104 taxa with either quotations or remarks, related to their existence within the province of Burgos, are mentioned. 36 out of these aforementioned ones, mean a novelty value for the provincial catalogue.

Se citan 45 taxones correspondientes a plantas vasculares no citadas previamente para la flora de la provincia de Soria, destacando entre ellas: Allium schoenoprasum L., Astragalus turolensis Pau, Blysmus compressus (L.) Panzer, Elatine alsinastrum L., Equisetum telmateja Ehrh., Haplophyllum linifolium (L.) G. Don fil., Meconopsis cambrica (L.) Vig., Narcissus rupicola Dufour, Prunus padus L., Ranunculus longipes L., Sedum nevadense Coss., etc. Además se indican puntualizaciones sobre otras once especies raras o poco conocidas en esta provincia.