blue thistle

Thesaurus

Noun

1.

blue thistle - a coarse prickly European weed with spikes of blue flowers; naturalized in United Statesblue devil, blueweed, Echium vulgare, viper's buglossherb, herbaceous plant - a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pestsEchium, genus Echium - a genus of bristly herbs and shrubs of the family Boraginaceae