Tragopogon porrifolius - Salsify "The Blues"
I've been growing out salsify for a number of years now and saving my own seed then resowing. Selection has been made for root development though in my unirrigated, lean fields I've not seen huge roots. Genetic material has been from all over, with a nice contribution from La Societe des Plantes in Quebec (highly recommend). Limited seed for the curious.