Chromosome counts for the Australian weed known as Senecio madagascariensis (Asteraceae)

Abstract

Chromosome counts of 2n = 20 for specimens of Senecio madagascariensis from Australia and from Madagascar are reported. By contrast, counts of 2n = 40 for a diversity of specimens of the S. lautus sensu lato complex are reported. These results support previous separation of these taxa on morphological grounds.