<em>Trifolium</em> accessions belonging to 13 clover species have been collected during a joint germplasm collecting mission organized in cooperation between USDA (USA) and ASAS (Romania) and samples were analysed for chromosome numbers. Eleven populations were 2n=14 diploid (<em>T. arvense</em> L., <em>T. campestre</em> L., <em>T. pratense</em> L.), eighteen populations were 2n=16 diploid (<em>T. alpestre</em> L., <em>T. echinatum</em> M. B., <em>T. hybridum</em> L., <em>T. fragiferum</em> L., <em>T. montanum</em> L., <em>T. orchroleucon</em> Huds., <em>T. repens</em> L.), three populations were 2n=4x=32 tetraploid (<em>T. dubium</em> Sibth., <em>T. repens</em> L.) and five were perhaps aneuploids on hexaploid, octoploid (<em>T. medium</em> L.), or higher ploidy levels (<em>T. pannonicum</em> Jacq.) Satellites were clearly identified in <em>T. arvense</em>, <em>T. hybridum</em>, <em>T. orchroleucon</em> and <em>T. pratense</em> accessions.
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