blueweed noun5 •Any member of any of several species of plants with blue flowers. •Chicory (Cichorium intybus). •Viper's bugloss (Echium vulgare). •Texas blueweed, blueweed sunflower (Helianthus ciliaris). •Flossflower, bluemink, pussy foot, Mexican paintbrush (Ageratum houstonianum). formsblueweeds