Commelina communis L. var. hortensis Makino

Family : Commelinaceae

Coniogramme intermedia Hieron. (Synonym : Coniogramme latibasis Ching)

Family : Pteridaceae

Coniogramme japonica (Thunb.) Diels (Synonym : Hemionitis japonica Thunb.)

Family : Pteridaceae

Coniogramme × fauriei Hieron. (Synonym : Coniogramme japonica (Thunb.) Diels var. fauriei (Hieron.) Tagawa)

Family : Pteridaceae

Conioselinum filicinum (H.Wolff) H.Hara (Synonym : Conioselinum nipponicum H.Hara)

Family : Apiaceae

Conioselinum kamtschaticum Rupr. (Synonym : Conioselinum gmelinii J.M.Coult. & Rose var. kamtschaticum (Rupr.) Hultén)

Family : Apiaceae

Conium maculatum L. (Synonym : Conium cicuta (Crantz) Neck.)

Family : Apiaceae [Naturalized plant]

Convallaria keiskei Miq. (Synonym : Convallaria majalis L. var. keiskei (Miq.) Makino)

Family : Liliaceae

Convolvulus arvensis L. (Synonym : Convolvulus arvensis L. var. multiflorus Choisy)

Family : Convolvulaceae [Naturalized plant]

Coptis japonica (Thunb.) Makino (Synonym : Coptis orientalis Maxim.)

Family : Ranunculaceae