Adiciones al catálogo florístico de la provincia de Soria, IV. Ampliaciones corológicas en el Sistema Ibérico y Valle del Ebro

A total of 15 rare taxa of vascular plants found in the province of Soria (central-north Spain) are here indicated, all of which constitute new records for this territory, such as Aster tripolium, Alyssum strigosum, Callitriche cribrosa, Carex extensa, Cheirolophus intybaceus, Gagea dubia, Juncus balticus subsp. pyrenaeus, Lens lamottei, Lonicera nigra, Poa supina, Ruppia maritima, Salvia sylvestris, Trifolium squarrosum, Valerianella martinii y Zannichellia contorta, etc. Moreover, all of them mean a novelty for the flora of Castilla y León region, with the only exceptions of Carex extensa, Juncus balticus subsp. pyrenaeus, Poa supina y Valerianella martinii. They are rare and scarce taxa in the territorial context of the Iberian Peninsula; some of them are peripheral or very local, other are restricted to scarce and well-preserved environments; generally showing an Iberian presence extent which is very diffuse or fragmented. All of them provide with an enlargement of their known distribution area, or with an improvement of their demarcation.