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
Rafflesia arnoldii whilst waiting for the British Museum to produce a better-prepared version. The generic name "Rafflesia", given in honour of Raffles and proposed by Brown, who had originally wanted to call it "Arnoldii" after Arnold, was validated by S. F. Gray in his report of the June 1820 meeting of the Linnean Society of London, as published in the "Annals of Philosophy" in September that year. The species "Rafflesia arnoldii" was officially described for the first time in 1821 by Brown, so that Arnold was commemorated after all. The flower of "Rafflesia arnoldii" grows to a diameter of around , but