On the ecology of varieties of Sonchus arvensis L.

The perennial sowthistle (Sonchus arvensis L.) - a geophytic composite - is found throughout the temperature regions of the world. From the middle of the 19th century dispersal has occured from the origin area of distribution in Europe and western Africa. [...] This study aims to find out by what mean(s) the varieties are adapted to their particular habitats and to trace the mechanisms responsible for their distribution patterns.... Zie: Summar