ibclogo XVI International Botanical Congess


Abstract Number: 4248
Poster No. = 555


SYSTEMATICS OF THE SEDGES (CAREX L.) OF RUSSIA AND ADJACENT STATES


T.V. Egorova, V.L. Komarov Botanical Institute, St. Petersburg, Russia


346 species of the genus Carex occur in the territory of the former USSR. 37 species of those are differentiated into subspecies. A new system of Carex is proposed. It contains all 5 known subgenera: Vigneastra (=subg. Indocarex), Carex, Kreczetoviczia , Vignea and Psyllophora (=subg. Primocarex), and 69 sections and 81 subsections. Analysis of the geographical distribution has shown 61 types of sedge distribution areas. 25 endemic sedges and 30 subendemic ones are known in these territories. The most number (8) of endemics is found in Middle Asia. 43 species and ssp. are endemic to the Floristic Provinces in the sense of A. Takhtajan. The greatest number of sedge endemics occur in the Manchurian (16) and Turkestanian Provinces (6). The evolution of Carex was probably paraphyletic. All 5 subgenera evolved in parallel from the general extinct ancestor, to which, apparently, the most primitive species of subg. Vigneastra are related. In the territory under consideration the least advanced sections are the Mundae, Decorae, Siderostictae, Carex and Tumidae sections. The highest evolutionary level is observed in the sections Chartoteuchium, Chlorostachyae, Limosae, Microrhynchae, Phacocystis, Canescentes and Physoglochin, representing cryophilous evolution trends, and in the section Lamprochlaenae, showing a xerophilous one.


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