Afrikander lily gladiolas
Iillustration from 'The Illustrated Needlework Book'
Pressmark 43 B 154
One of the characteristics of Florence Caulfield's plant embroidery was that she generally avoided shading in favour of solid blocks of colour. Perhaps because the proportion of stems and leaves here is so high, she suggested shading as a possible alternative to the three-colour shade version shown here.
This plant is probably what would be described today as gladiolus carinatus, commonly known as the blue or mauve afrikander.