﻿AbstractThe new speciesSileneisabellaeis described and illustrated from the Skënderbëut mountain range of central Albania. It grows on the ultramafic mountain slopes around Qafë Shtamë, in the understorey of openPinusnigraforests and in the rocky grasslands above the forest belt, at 1000–1600 m a.s.l.Sileneisabellaeis a serpentine endemic likely belonging to sectionElisanthe(Fenzl ex Endl.) Ledeb. and shows affinities with the widespread European speciesS.noctifloraL. It is sharply distinct from the latter species in habit, stem and leaf pubescence, morphology, and biology of the flowers and length of the carpophore. Moreover, the ecology of the two taxa is also contrasting, beingS.noctifloraa synanthropic-ruderal, mostly in lowlands. Weaker similarities were also observed with the south European subalpine taxa of the group ofS.vallesiaL. of sectionAuriculatae(Boiss.) Schischk., though these are not likely to reflect a real systematic affinity.