He also asserted that neither the
butterworts (Pinguicula) (or the other Lentibulariaceae:
Genlisea and Utricularia) nor the Asian pitcher plants
(Nepenthes) were ‘at all related to the Droseraceae’ (Insectivorous
plants, p. 292). Darwin appears to have had little
familiarity with the American pitcher plants (Sarracenia,
Darlingtonia, and Heliamphora), nor did he discuss the
Australian pitcher plant Cephalotus follicularis Labill.
(Cephalotaceae),2 but it is safe to say that he recognized
at least three lineages of carnivorous plants: his
2 Sarracenia