What are the really rare carnivorous plants?
I think the best list of the rarest carnivorous plants is the one that was drafted by the ICPS and its conservation partners in 2003. That list, and the species-by-species justifications for listing, are given below: ICPS Imperiled Carnivorous Plant Species List Dionaea muscipula Soland. ex Ellis: Note B Drosera regia Stephens: Note B Nepenthes aristolochioides Jebb & Cheek: Note A Nepenthes bellii Kondo: Note A Nepenthes boschiana Korth.: Note A Nepenthes burbidgeae Hook.f. ex Burb.: Note A Nepenthes campanulata Kurata: Note C Nepenthes clipeata Danser: Note A Nepenthes dubia Danser: Note A Nepenthes gracillima Ridl.: Note A Nepenthes lavicola Wistuba & Rischer: Note A Nepenthes macrophylla (Marabini) Jebb & Cheek: Note A Nepenthes masoalensis Schmid-Hollinger: Note A Nepenthes murudensis Culham ex M. Jebb & M. Cheek: Note A Nepenthes paniculata Danser: Note A Nepenthes pilosa Danser: Note A Nepenthes rajah Hook. f.: Note A Nepenthes talangensis J. Nerz & A. Wistuba: Note A Nepenthes