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BiologyAlthough it does contain the green pigment chlorophyll and photosynthesizes, marsh lousewort also obtains some nutrients by feeding on the roots of a host plant (3). It is therefore dubbed a 'hemiparasite' (3). It grows as either an annual or a biennial (3). The flowers are pollinated by various bumble-bees, which are attracted to the flowers by the nectar (2).