I found these fritillaries in a church in Surrey while I was visiting to see a completely different window. Chance finds like this are what make stained glass so rich and rewarding. It is so poorly documented (and attributed) that you can often go to a place for a specific window and discover there's a lot more than you'd expected. Like this wonderful Arts and Crafts window with bright, chequered fritillaries. It is attributed to Karl Parsons (1884-1934), but I am not so sure and think it might be by Louis Davis (1860-1941) who was particularly good at little flowers like snowdrops, lily-of-the-valley and daisies set against brilliant emerald glass. His work looks like coloured-in woodcuts and makes me think of children's illustrated books.
[I did some research and it It is by Louis Davis]