A late comment on GordonJ's posting.
I too had tried with Crepis incana seeds a few years ago but only one germinated and didn't live for very long. Last year I bought 4 plants in the UK and brought them back to Rome. None of them flowered and only one of them managed to hang on through the summer but was so weak it didn't make it through the autumn. Too hot it would seem in a Mediterranean lowland area.
This year I thought I would give Crepis rubra a try, an annual which I saw in Puglia, southern Italy, a couple of years ago. A little more success this time with the first flowers opening. Paler than I remember them from Puglia and one of them white! Hope the display will be more impressive as more flowers open. I have dotted seeds all around. Next time I think I will try with an autumn sowing too as In Puglia the flowers were out in early April.