Cuscuta chinensis Lam. (Synonym : Cuscuta fimbriata Bunge ex Engelm.)

Family : Convolvulaceae

Cuscuta japonica Choisy (Synonym : Cuscuta japonica Choisy var. thyroidea Engelm.)

Family : Convolvulaceae

Cycas revoluta Thunb.

Family : Cycadaceae

Cyclosorus interruptus (Willd.) H.Itô (Synonym : Dryopteris gongylodes (Schkuhr) Kuntze)

Family : Thelypteridaceae

Cyclosorus parasiticus (L.) Farw. (Synonym : Christella parasitica (L.) H.Lév.)

Family : Thelypteridaceae

Cyclospermum leptophyllum (Pers.) Sprague ex Britton & P.Wilson (Synonym : Selinum leptophyllum (Pers.) E.H.L.Krause)

Family : Apiaceae [Naturalized plant]

Cymbidium ensifolium (L.) Sw. (Synonym : Epidendrum ensifolium L.)

Family : Orchidaceae

Cymbidium goeringii (Rchb.f.) Rchb.f. (Synonym : Maxillaria goeringii Rchb.f.)

Family : Orchidaceae

Cymbidium kanran Makino (Synonym : Cymbidium oreophyllum Hayata)

Family : Orchidaceae

Cymbidium lancifolium Hook. (Synonym : Cymbidium nagifolium Masam.)

Family : Orchidaceae