Leaves of these plants feel greasy, hence the name Pinguicula which is derived from Latin, meaning fat and small. W. Marshall observed that insects became mired on the leaves of these plants. Being aware of Darwin's studies of the carnivorous nature of Drosera, Marshall communicated his observations to Darwin. Darwin subsequently investigated the matter and proved to his satisfaction that plants in the genus Pinguicula are indeed carnivorous plants. The common name for this genus is Butterwort.
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