上位捕虫笼

上位捕虫笼upper pitcher),简称上位笼,是猪笼草捕虫笼的一种形态。当猪笼草植株生长到一定程度后,如具攀援茎后,其捕虫笼就会由下位笼转变成上位笼。下位笼和上位笼在形态上有明显的区别,下位笼更矮胖,上位笼更细长。大部分猪笼草上位笼的笼翼都退化为一对隆起。

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