Estudios cromosómicos en especies argentinas de Vernonia (Asteraceae)

DEMATTEIS, M.

Bonplandia

Instituto de Botánica del Nordeste

Lugar: Corrientes; Año: 1996 vol. 9 p. 103 - 110

The chromosomes of eleven Vernonia species from Argentina are studied. The results include counts in seven species that have never been investigated cytologically. The karyotype of six taxa are analized, five of them are described for the first time: V. chamaedrys n=17, 2n=34= 22m + 12 sm; V. loretensis n=17, 2n=34= 20m + 14 sm; V. rubricaulis n=16, 2n=32= 20m + 12sm; V. remotiflora n=14, 2n=28= 16m + 12sm and V. lepidifera n=10, 2n=20= 8m + 12sm. The record of 2n=4x=28 for V. remotiflora support the existence of the basic chromosome number x=7. Previously reported chromosome counts show that Vernonia is multibasic with x=7, 9, 10, 11, 12, 15, 17 and 19. The significance of the results is discussed in relation to chromosomal data available for the genus.