Caladenia chlorostyla 
Caladenia dimidia 
Caladenia pholcoidea 
Calamagrostis effusa 
Calanthe beamanii 
Calanthe discolor 
Calanthe lacerata 
Calanthe pulchra 
Calanthe triplicata 
Calendula tripterocarpa 
Calla 
Calla lily 
Calochilus platychilus 
Calochortus aureus 
Calypso orchidfairy slipper 
Camas 
Camptandra ovata 
Campylocentrum micrantum 
Campylocentrum palominoi 
Canada lily 
Canada Mayflower 
Canada onion 
Canary Island Palm 
Canary Islands dragon tree