Abstract
The karyotypes of seven South American species of Vernonia were analyzed in detail. First chromosome count are reported for V. amplexicaulis (2n=34=24m+10sm), V. ferruginea (2n= 34=20m+14sm), V. pinguis (2n=68=42m+26sm) and V. squamulosa (2n=34=20m+2m-sm+ 12sm). Furthermore, the chromosome numbers of V. chamaedrys (2n=34=22m+12sm), V. fulta (2n=34=24m+ 10sm) and V. nudiflora (2n=34=24m+ lOsm) are also confirmed. The seven species showed similar karyotype symmetry, chromosome size and satellite position, which would support a close relationship among them. Chromosomal data available for the genus and the results obtained here suggests that species with pyramidal or thyrsoid inflorescence have x=17, while entities with scorpioid or seriate inflorescence possess mainly basic numbers x=16, x=15 or x=14.
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