It is generally tubular in form, but in some species two forms are produced on the same plant, lower or terrestrial goblet-shaped pitchers and upper suspended pitchers retaining the more primitive more or less tubular form; in a few species a third form - funnelor cornucopia-shaped pitchers - occurs in the upper part.
A study of the development of the pitcher, especially in the young pitchers of seedling plants, shows that the inflated portion is a development of the midrib of the leaf, while the wings, which are especially well represented in the terrestrial type of pitcher, represent the upper portion of the leaf-blade which has become separated from the lower portion by the tendril; the lid is regarded as representing two leaflets which have become fused.
The colour also varies considerably, even in different pitchers of the same individual, FIG.
- Cephalotus follicularis, showing ordinary leaves and pitchers, the right hand one cut open to show internal structure.
The pitchers accumulate vast quantities of insects in the course of a season, and must thus abundantly manure the surrounding soil when they die.
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