1. Abbott, R. J., Ashton, P. A., Forbes, D. J., 1992: Introgressive origin of the radiate groundsel,Senecio vulgaris L. var.hibernicus Syme:Aat-3 evidence. ? Heredity68: 425?435.
2. Abbott, R. J., Curnow, D. J., Irwin, J. A., 1995: Molecular systematics ofSenecio squalidus L. and its close diploid relatives. ? InHind, D. J. N., Jeffrey, C., Pope, G. V., (Eds): Advances inCompositae systematics, pp. 223?237. ? Kew: Royal Botanic Gardens.
3. Alexander, J. C. M., 1975: Experimental taxonomy in some annual species ofSenecio from the Mediterranean area. ? Ph.D. Thesis, University of Edinburgh, Scotland.
4. , 1979: Mediterranean species ofSenecio sectionSenecio andDelphinifolius. ? Notes Roy. Bot. Gard. Edinburgh37: 387?428.
5. Avise, J. C., 1994: Molecular markers, natural history and evolution. ? New York: Chapman & Hall.