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Definition of White thistle
1. Noun. Any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America.
Exact synonyms: Argemone, Devil's Fig, Prickly Poppy
Group relationships: Genus Argemone
Specialized synonyms: Argemone Mexicana, Mexican Poppy
Generic synonyms: Herb, Herbaceous Plant
Group relationships: Genus Argemone
Specialized synonyms: Argemone Mexicana, Mexican Poppy
Generic synonyms: Herb, Herbaceous Plant
2. Noun. Spiny shrub with silvery-scurfy foliage of alkaline plains of southwestern United States and Mexico.