Centaurea

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Centaurea

a genus of thistles of the Asteraceae family of plants; contain sesquiterpene lactones which cause nigropallidal encephalomalacia in horses. Includes C. melitensis (Maltese cockspur), C. repens (C. picris, Russian or creeping knapweed, hard heads), C. solstitialis (yellow star or St. Barnaby's thistle).
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Centaurea solstitialis. By permission from Knottenbelt DC, Pascoe RR, Diseases and Disorders of the Horse, Saunders, 2003