Hymenonema is a Greek endemic genus consisting of two species, H. laconicum and H. graecum, occurring
in the lowlands of S Peloponnisos and on most of the C Aegean islands, respectively. Morphological investigation
of 20 gatherings covering the entire distribution range revealed clear morphological differences between the
two species, mainly in pappus, achenes, anther tube, ligules and basal leaf
... [Show full abstract] characters. A corresponding emended
identification key to the species is given. Karyological investigation of 11 accessions included karyotypes, idiograms
and karyological indices for both species. Six karyomorphological parameters were also statistically analysed. Populations
with intermediate morphological characters between the two species are recorded for the first time and their
relationship with the typical two species is discussed. The geographical distribution of the genus is mapped and
doubtful locations are commented on. The cytotaxonomic data and the geographical distribution of the species support
the characterization of H. laconicum and H. graecum as schizoendemics. The conservation status of both species
is suggested as Vulnerable (VU) according to IUCN criteria.