Ontogeny and Anatomy of the Dimorphic Pitchers of Jack.

An enigmatic feature of tropical pitcher plants belonging to the genus is their dimorphic prey-capturing pitfall traps. In many species, the conspicuously shaped upper and lower pitchers grow from a swollen leaf tendril tip until finally opening as insect-alluring devices. Few have studied the ontogeny of these traps from an anatomical and quantitative morphological perspective.