The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher, filled with water, and covered with a lid. This design helps it to trap unsuspecting insects that are then digested.
GalleriesFlowers and Shrubs: P
John Merle Coulter, C.R. Barnes and H.C. Cowles, A Textbook of Botany for Colleges and Universities (New York:American Book Company, 1910) 385