KARYOLOGY OF SOME CRITICAL TAXA ON CALAMINE SOILS (CAVE DEL PREDIL, JULIAN ALPS, ITALY). The results of chromosome counts and analyses of karyotype asimmetry on polymorphic taxa growing on calcareous and metalliferous soils and on tailings of a zinc and lead mine are reported. The investigated taxa are: Biscutella laevigata L. subsp. laevigata (2n=36); Dianthus sylvestris Wulf. (211=30); Erysimum sylvestre (Cr.) Scop. (2n=l4); Minuartia venia (L.) Hiern. (211=24); Viola tricolor L. subsp. subalpina Gaudin (211=26) and its var. raiblensis Lausi et Cusma (2n=26) of the same subspecies; Alyssum wulfenianum Bernh. (2n=16); Thlaspi cepaeifolium (Wulf.) Koch subsp. cepaeifolium (2n=14). New chromosome numbers are reported for Alyssum wulfenianum and for Thlaspi cepaeifolium in its locus classicus.
