Robert Thornton ( 1768 - 1837 ) was a British painter. Robert Thornton s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 108.64 USD for The Maggot-bearing Stapelia in 2004 to 1300 USD for THE WHITE LILY WITH VARIEGATED-LEAVES in 2006 , based on the size and medium of the artwork.