Definition of black sage
1 : a woolly-leaved plant (Trichostema lanatum) native to southern California and Mexico
2 : any of several plants of the genus Cordia; especially : an introduced weed (C. macrostachya) that is a serious pest in sugar plantations on Mauritius
3 : a common highly inflammable California sage (Salvia mellifera) that is the chief source of sage honey
4 : either of two sagebrushes (Artemisia arbuscula and A. tridentata) of the western U.S.
5 : a California herb (Audibertia stachyoides)
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