O'LEARY Nataly Cristina
Chromosome studies on eight species of Eryngium L. (Saniculoideae, Apiaceae) from Argentina
CALVIÑO CAROLINA; O'LEARY NATALY; MARTÍNEZ SUSANA; GREIZERSTEIN EDUARDO; POGGIO LIDIA
Univ. FLorence Botany Inst.
Lugar: Florencia, Italia; Año: 2002 vol. 55 p. 315 - 315
A cytological analysis of eight Argentinean species of Eryngium L.(Saniculoideae, Apiaceae) is carried out. Karyotypes of eight species andoriginal chromosome counts for three of them (indicated with an asterisk)are notified: E. coronatum* Hook. et Arn. (2n=2x=16; 14m + 2sm), E.echinatum Urb. (2n=2x=16; 12m + 2m-sm + 2sm), E. nudicaule Lam. (2n=2x=14;8m + 2m-sm + 4sm), E. eburneum Decne. (2n=2x=16; 8m + 2m-sm + 6sm), E.horridum Malme (2n=2x=16; 12m + 4sm), E. megapotamicum* Malme (2n=4x=32;4m + 6m-sm + 22sm), E. mesopotamicum* Pedersen (2n=6x=48; 30m + 16sm+2st), and E. pandanifolium Cham. et Schlechtd. (2n=6x=48; 26m + 4m-sm+14sm + 4st). The first three species belong to the Section Foetida, whilethe remaining five, belong to Panniculata. Both Sections are easilydifferentiated by morphology; our chromosomal study shows that thesesections can also be recognized karyologically. All the species, except E.nudicaule (x=7), present x=8 which is the most common basic chromosomenumber in the genus and in the subfamily Saniculoideae. The karyotypeanalysis made on the eight species mainly shows metacentric andsubmetacentric chromosomes differing in proportion between species; onlyE. pandanifolium and E. mesopotamicum show subtelocentric pairs. These twospecies only differ in the color of their inflorescences; besides,differences in their karyotypes were negligible. These facts agree withthe suggestion that they would be varieties of the same species. Twodifferent phenomena seem to have occurred during karyotype evolution inthe genus Eryngium: aneuploidy within Section Foetida, and polyploidywithin Section Panniculata.