SALSIFY
You eat the long, thin, brown coloured roots in late Autumn but this vegetable is probably an acquired taste. The plants have a pretty purple daisy like flower. A hardy biannual, from the Sandwich Islands, and easily grown from seed. The flower bud is edible.
SCORZONERA
A perennial, very similar to Salsify except that the edible root has a black skin, and the flowers are a yellow daisy-like flower. Originally from Spain, it is easily grown from seed sown in situ. Can be harvested through the winter. The flower bud is also edible.
So it is the colour of the roots and the colour of the flowers that will identify which plant you have.
An Italian plotter tells me that scorzonera grows wild in Italy.
I am not growing either this year, as I have got bored with them!
This information is taken from my web site, given below.