- blueweed, blue devil, blue thistle, viper's bugloss, Echium vulgare - a coarse prickly European weed with spikes of blue flowers; naturalized in United States
--1 is a kind of herb, herbaceous plant
--1 is a member of Echium, genus Echium - amobarbital sodium, blue, blue angel, blue devil, Amytal - the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic
--2 is a kind of amobarbital