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|Noun||1.||white thistle - any plant of the genus Argemone having large white or yellow flowers and prickly leaves and stems and pods; chiefly of tropical America|
genus Argemone - prickly poppies
Argemone mexicana, Mexican poppy - annual herb with prickly stems and large yellow flowers; southern United States to West Indies and Mexico
|2.||white thistle - spiny shrub with silvery-scurfy foliage of alkaline plains of southwestern United States and Mexico|
saltbush - any of various shrubby plants of the genus Atriplex that thrive in dry alkaline soil