Abstract
The karyotypes of two endemic species such as Asterothamnus heteropappoides and A. poliifolius from South Siberia were studied. Both species were diploids with the chromosome numbers of 2n = 2x = 18. The polyploidy and satellites were not found. For the first time, the chromosome morphology has been studied and the idiograms have been plotted. The chromosome sizes ranged from 6.42 to 4.23 µm for A. heteropappoides and the karyotype formula of 8m + 1sm and that from 5.88 µm to 3.64 µm for A. poliifolius and featuring the karyotype formula of 9m.
Highlights
The genus Asterothamnus Novopokr. belongs to the subtribe Asterinae (Cass.) Dumort
Materials and methods The plants for the study were collected in the territories of Ovyursky and Tes-Khemsky Regions of the Republic of Tyva
The herbarium samples are stored at the Herbarium of the Central Siberian Botanical Garden SB RAS (NS)
Summary
The genus Asterothamnus Novopokr. belongs to the subtribe Asterinae (Cass.) Dumort. (the tribe Astereae, the family Asteraceae). Belongs to the subtribe Asterinae (Cass.) Dumort. According to Nesom & Robinson (2007), it includes 13 genera and approximately 270 species. The molecularphylogenetic analysis of the subtribe Asterinae (Li et al, 2012; Korolyuk et al, 2015) states the differentiation of Asiatic taxa into five wellsupported clades. These are the Galatella group with the species of Asian genera Galatella Cass. (2) the Heteropappus group including Heteropappus Less. Kalimeris Cass., as well as (3) Asterothamnus group.
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