Josef Knapp ( 1810 - 1867 ) was a painter. Josef Knapp s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 374.48 USD for Lilium candidum in 2007 to 907.57 USD for Clematis, sweet pees, flower studies, two sheets in 2011 , based on the size and medium of the artwork.