In this paper we present the results of a geobotanical study carried out on the communities of Cytisus oromediterraneus and Genista cinerascens in Serra da Estrela, two species that in the Central Iberian Peninsula lead the associations Cytiso oromediterranei-Genistetum cinerascentis and Pteridio aquilini-Cytisetum oromediterranei. The prime objective was to describe their geographical and main ecological features, floristic structure and composition, as well as local dynamics. The sampling analyses were carried out using Braun–Blanquet’s methodology, and respective outcomes were studied using the phytosociological methodology, combined with a statistic analysis performed through the Vegana package. The results indicate that the Portuguese community of Cytisus oromediterraneus and Genista cinerascens represents a new association, that we called Teucrio salviastri-Cytisetum oromediterranei. This is an association endemic from the Estrelensean territories, siliceous, hyperhumid to ultrahyperhumid, present in supra-orotemperate territories with evident Mediterranean influence.