Most parasitic plants entwine themselves round and round their hosts and feed off the stems of their hosts with their suckers.
The broomrape, however, eats off the roots of other plants. All its parasitic activity is carried on below the ground and the only growth above the ground is when it flowers. Like the broomrape, the toothwort also feeds off the roots of other plants. But unlike the broomrape, some of its flowers bloom below the ground.