NEPENTHES - the peristome

Nepenthes x mixta, cross section of peristome
Nepenthes x mixta, the toothed pitcher edge seen from inside the pitcher.
Nectary sunk between two peristome teeth

The pitcher edge (peristome) of pitcher plants (Nepenthes) are T-shaped in cross-section, and the T-arms are bent back. The surface is grooved, shiny and often reddish, and the edges are toothed. Between the teeth on the inner rim are large nectaries consisting of several hundred cells. The bend and the downward-pointing teeth help prevent a trapped animal from crawling out of the jug again.

Henning S. Heide-Jørgensen, Dec. 2009. Translated Jan. 2024.