Try to make your search as simple as possible:
Furcraea will find all items including that sequence of letters.
Search results for "Furcraea":
"Furcraea cantula" - Agave cantula
"Furcraea cubensis" - Furcraea hexapetala
"Furcraea gigantea" - Furcraea foetida
"Furcraea parmentieri" - Furcraea longaeva