Rafflesia Park where the flowers are numbered and monitored by the park rangers. "Rafflesia" are also remarkable for showing a large horizontal transfer of genes from their host plants. This is well known among bacteria, but not higher organisms. The name "corpse flower" applied to "Rafflesia" can be confusing because this common name also refers to the titan arum ("Amorphophallus titanum") of the family Araceae. Moreover, because "Amorphophallus" has the world's largest unbranched inflorescence, it is sometimes mistakenly credited as having the world's largest flower. Both "Rafflesia" and "Amorphophallus" are flowering plants, but they are only distantly related. "Rafflesia arnoldii" has
Unplaced in APG II Samydaceae as a separate family from Salicaceae. Several genera have been removed from Rafflesiaceae, so that it now consists of only three genera: "Sapria", "Rhizanthes", and "Rafflesia". All of these are holoparasites and, as discussed below, finding their relationships by molecular phylogenetics has presented special challenges. "Rafflesia" and its relatives were the subject of several papers from 2004 to 2009, and as the world's largest flower, "Rafflesia" has attracted special interest. In 2009, Wurdack and Davis confirmed earlier work in which it was found that Rafflesiaceae is nested within Euphorbiaceae sensu stricto, a circumscription of Euphorbiaceae that excludes Phyllanthaceae, Picrodendraceae,