Yer·ba n.  Bot. An herb; a plant.
  Note: ☞ This word is much used in compound names of plants in Spanish; as, yerba buena , a name applied in Spain to several kinds of mint (Mentha sativa, Mentha viridis, etc.), but in California universally applied to a common, sweet-scented labiate plant (Micromeria Douglasii).
  Yerba dol osa. 
  Yerba mansa. 
  Yerba reuma. 
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  Micromeria douglasii
       n : trailing perennial evergreen herb of northwestern United
           States with small white flowers; used medicinally [syn: yerba
           buena, Micromeria chamissonis, Satureja douglasii]