Chromosome numbers of 25 taxa of flowering plants from northern Norway and Svalbard are reported. Four species and one subspecies,Carex halophilaF. Nyl. (2n = ca. 78), C.stenolepisLess. (2n = ca. 80),SalicorniapojarkovaeN. Sem. (2n = 36),Alnus incano(L.) Moench ssp.kolaensis(Orlova) Love (2n = 28), andSaxifraga svalbardensisD. O. Øvstedal (2n = ca. 64), have not been studied karyologically before. Chromosome numbers of four additional species are reported for the first time from Norway; those of another six species for the first time from northern Norway. The hybridSalix herbaceaL. (2x) x 5.polarisWahlenb. (6x) is proved tetraploid and may be fertile. A possible hybrid betweenSaxifraga hyperboreaR. Br. andS. rivularisL. was revealed
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