n 1 a cap : a small genus of resinous shrubs (family Hydrophyllaceae) of southwestern No. America having finely reticulated leaves often woolly beneath and white or bluish flowers b : any plant of the genus Eriodictyon 2 : the dried leaves of yerba santa (Eriodictyon californicum) used as a flavoring in medicine esp. to disguise the taste of quinine .
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