In most species the inside of the pitcher is zoned similarly to the ascidiform leaves found in most pitcher plants. The hood, when present, is plentifully strewn with nectar glands. Just below it, in the region of the opening and below, are numerous long, flexible, downward pointing hairs intermingled with nectar glands. This region attracts insects, offering them an unstable foothold. The next lower region is distinguished by smooth pitcher walls which prevent insects from maintaining a foothold. The walls of the lowermost region of the pitcher have sharp, stout, downward pointing hairs that prevent the upward movement of prey. (Fig. 3-27) Digestion, according to current knowledge, is due to bacterial activity in the watery bath that is maintained within the pitcher in nature by heavy rainfalls.

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