The Passiflora cases are truly wonderful, like the Crinum cases (see "Origin").

I earnestly hope that you will experiment on Passiflora, and let me give your results.

Sincere thanks for all your laborious trials on Passiflora.

In 1869, Sir Thomas Farrer corresponded with my father on the fertilisation of Passiflora and of Tacsonia.

Flowers on a completely self-impotent plant of Passiflora alata fertilised with pollen from its own self-impotent seedlings were quite fertile.