white willow bark

bark (bahrk) the rind or outer cortical cover of the woody parts of a plant, tree, or shrub.

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cramp bark  the dried bark of Viburnum opulus, the high bush or cranberry tree; it has been used as an antispasmodic, uterine sedative, and antiscorbutic.

elm bark , slippery elm bark the dried inner bark of the slippery elm, Ulmus rubra, which is mucilaginous and demulcent.

white willow bark  a preparation of the bark of various Salix species collectively known as white willow, containing salicin, a precursor of salicylic acid; used as an antiinflammatory and antipyretic.

yohimbe bark  a preparation of the bark of Pausinystalia yohimbe, used for the same indications as yohimbine hydrochloride; it has also been used traditionally as an aphrodisiac and for skin diseases and obesity.

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white willow bark,

a preparation of the bark of various Salix species native to central and southern Europe and collectively known as white willow, containing salicin, a precursor of salicylic acid, to which it is converted metabolically. It is used as an antiinflammatory and antipyretic.