Rafflesia arnoldii which then pollinate the rare plant. It is not to be confused with the titan arum, "Amorphophallus titanum", which is also commonly referred to as the "corpse flower" because of its repulsive odor. "Rafflesia arnoldii" is rare and fairly hard to locate. It is especially difficult to locate the flower in forests, as the buds take many months to develop and the flower lasts for just a few days. The flowers are unisexual and thus proximity of male and female flowers is vital for successful pollination. These factors make successful pollination a rare event. When "Rafflesia" is ready to reproduce,
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,