What is the fine-grained topic of the following text: In 2007, he was a member of a successful expedition led by famed horticulturalists Don Bryne (of Sewanee Laboratories) and Patrick Nutt (33-year veteran of Longwood Gardens) to the Brazilian Amazon in search of the elusive Dwarf Victoria Lily, a new species of water lily never before identified. Only return the topic.
2007 Expedition to the Brazilian Amazon for the Dwarf Victoria Lily