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What is another word for white thistle?

What's another word for white thistle? | Here's a list of synonyms for white thistle.

Definition 1: spiny shrub with silvery-scurfy foliage of alkaline plains of southwestern United States and Mexico - [noun denoting plant]

Definition 1: any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America - [noun denoting plant]