blue thistle

Definitions of blue thistle
1

n a coarse prickly European weed with spikes of blue flowers; naturalized in United States

Synonyms:
Echium vulgare, blue devil, blueweed, viper's bugloss
Type of:
herb, herbaceous plant
a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

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