2 Sarracenia is mentioned in passing only on the penultimate page of
Insectivorous plants. In a letter to W Thiselton-Dyer (letter 724 in F Darwin,
1903), he refers to Asa Gray’s examination of Sarracenia. In a letter to JD
Hooker (letter 726 in F Darwin, 1903), he writes of hoping that Hooker will
resume work on Cephalotus and Sarracenia and provide comparative data for
Darwin’s ongoing studies of Utricularia.