Biogeographical scenario of species with C genome in O. officinalis complex. Above: divergence time calculated using Bayesian relaxed-clock methods (the cladegram narrowed from Figure 2). Below: Distribution areas (outline and noted) and inferred migration procedure among continents. CC diploids (eic = O. eichingeri, off = O. officinalis, rhi = O. rhizomatis), BBCC tetraploids (pun = O. punctata, mal = O. malampuzhaensis, min = O. minuta), and CCDD tetraploids (lat = O. latifolia, alt = O. alta, gra = O. grandiglumis).
Wang et al. BMC Evolutionary Biology 2009 9:250 doi:10.1186/1471-2148-9-250