Both they carry Gladiolus italicus forma alba !!
G. byzantinus is different, the photo shown in PDN is clearly G. italicus
and I do have Patty's strain.

If I have time, I will post something about the differences among G.
italicus, G. byzantinus and G. communis (which are separated species)

I have yet to find someone with a white form of true G. byantinus

Angelo Porcelli
Apulia - South of Italy

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