1. (

• agueweed ,
• ague_weed ,
• five-flowered_gentian ,
• stiff_gentian ,
• Gentianella_quinquefolia ,
• Gentiana_quinquefolia

) gentian of eastern North America having clusters of bristly blue flowers ;

2. (

• boneset ,
• agueweed ,
• thoroughwort ,
• Eupatorium_perfoliatum

) perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine ;