Abstract
Chromosome numbers (2n) in 16 invasive plant species from the families Amaranthaceae, Asteraceae, Caryophyllaceae, Lamiaceae, Onagraceae and Poaceae are reported on the material from the Altai Republic for the first time. Among them, chromosome complements were first examined in Russia for Chaiturus marrubiastrum (L.) Ehrh. ex Reichenb. (2n = 24) and Oenothera villosa Thunb. (2n = 14). Five species: Amaranthus lividus L. (2n = 34), Elisanthe noctiflora (L.) Rupr. (2n = 24), Galeopsis speciosa Mill. (2n = 16), Oenothera biennis L. (2n = 14) and Bromus japonicus Thunb. (2n = 14), were studied first from Siberia. The most part of the species studied are diploids. The general distribution and the history of floristic findings of these species in the Altai Republic are given. The data on chromosome numbers published earlier on the material from Russia are cited. 
Highlights
We provide an information on the history of floristic studies on examined species at the territory of the Altai Republic, and in some cases – in Siberia
E. Zykova, Z8–5014” (NS); “Russia, Altai Republic, Ulagan district, Balyktuyul village, nearly Pazyryksk mounds, roadside 50°45′N, 88°02′E
Summary
Amaranthus retroflexus L., 2n = 32 “Russia, Altai Republic, Mayma district, vicinity of Rybalka village, wasteland at a construction site, 51°55′N, 85°51′E. “Russia, Altai Republic, Choya district, vicinity of Choya village, wasteland, 52°02′N, 86°33′E. E. Zykova, Z284–3715” (NS); “Russia, Altai Republic, Turochak district, vicinity of UstLebed village, roadside, 52°17′N, 87°20′E. E. Zykova, Z283–4015” (NS); “Russia, Altai Republic, Shebalino district, vicinity of Cherga village, wasteland at the river bank 51°34′N, 85°34′E.
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