• Calandrinia ciliata
• Calochortus albus
• Calochortus luteus
• Calochortus venustus
• Calycadenia truncata
• Camissonia graciliflora
• Cardamine californica
• Castilleja affiniis
• Castilleja exserta
• Cirsium occidentale
• Clarkia concinna
• Clarkia purpurea
• Clarkia unguiculata
• Claytonia perfoliata
• Collinsia heterophylla
• Cynoglossum grande