Try to make your search as simple as possible:
Catapodium will find all items including that sequence of letters.
Search results for "Catapodium":
"Catapodium loliaceum" - Catapodium marinum
"Catapodium patens" - Micropyrum patens
"Catapodium tenellum" - Micropyrum tenellum
"Catapodium tuberculosum" - Castellia tuberculosa