clarkia Syllabification: (clark·i·a)Pronunciation: /ˈklärkēə/Definition of clarkia noun a North American plant with showy white, pink, or purple flowers, cultivated as a border plant in gardens. Genus Clarkia, family Onagraceae Origin:modern Latin, named after W. Clark (see Clark, William), who discovered itclarkia in other Oxford dictionaries Definition of clarkia in the British & World English dictionary