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Noun: white thistle
  1. Any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America
    - prickly poppy, argemone, devil's fig
     
  2. Spiny shrub with silvery-scurfy foliage of alkaline plains of southwestern United States and Mexico
    - quail bush, quail brush, Atriplex lentiformis

Derived forms: white thistles

Type of: herb, herbaceous plant, saltbush

Part of: genus Argemone