WEBAloe hereroensis, showing inflorescence with branched peduncle Amorphophallus titanum has the world's largest unbranched inflorescence. Photo of the plant in bloom in 2000 at Fairchild Tropical Botanic Garden in Miami, Florida, US. An inflorescence, in a flowering plant, is a group or cluster of flowers arranged on a stem that is composed of a main branch or a system of branches.