1. A genus of herbs of the family Scrophulariaceae with brightly coloured irregular flowers
   - Antirrhinum

Type of: asterid dicot genus

Part of: family Scrophulariaceae, figwort family, foxglove family, Scrophulariaceae

• family Orchidaceae
• family Orectolobidae
• family Oriolidae
• family Ornithorhynchidae
• family Orobanchaceae
• family Orycteropodidae
• family Oscillatoriaceae
• family Osmeridae
• family Osmundaceae
• family Osteoglossidae
• family Ostraciidae
• family Ostraciontidae
• family Ostreidae
• family Otariidae
• family Otididae
• family Oxalidaceae
• family Oxyuridae
• family Paeoniaceae
• family Paguridae
• family Palaemonidae
• family Palinuridae
• family Palmaceae
• family Palmae
• family Pandanaceae
• family Pandionidae