Chromosome numbers in some alien plant species of the Novosibirsk Region: post VIII

This paper presents the chromosome numbers (2n) for 11 alien species from the families Asteraceae, Brassicaceae, Caryophyllaceae, Euphorbiaceae, Fabaceae, Poaceae, Polygonaceae, Portulacaceae, Rosaceae, Solanaceae, collected in the Novosibirsk Region. For Euphorbia platyphyllos (2n = 28), chromosome number was determined for the first time on the material from Russia; for Alkekengi officinarum (2n = 24) – from Asian Russia; for Armoracia rusticana (2n = 32), Aruncus dioicus (2n = 18) and Scleranthus annuus (2n = 44) – from Siberia. Chromosome numbers on the material from the Novosibirsk Region were revealed for the first time for Medicago sativa (2n = 32), Avena fatua (2n = 42), Rumex acetosella (2n = 14) and Portulaca oleracea (2n = 36). For all the species studied, brief notes on their general distribution and dispersal in the Novosibirsk Region are provided, along with literature data on chromosome numbers from other regions of Russia.