Gladiolus communis ssp byzantinus 'Albus'

Gladiolus communis byzantinus Albus 1979
Photographed at the Royal Botanic Gardens, Kew.

This is the only time I have ever seen the white form, though I have been looking for 30 years. Mostly, plants circulated under the name are forms of G.nanus (and I think this one probably was as well!)