\Yer"ba\, n. [Sp.] (Bot.)
An herb; a plant.
Note: This word is much used in compound names of plants in
      Spanish; as, yerba buena [Sp., a good herb], a name
      applied in Spain to several kinds of mint ({Mentha
      sativa}, {viridis}, etc.), but in California
      universally applied to a common, sweet-scented labiate
      plant ({Micromeria Douglasii}).
{Yerba dol osa}. [Sp., herb of the she-bear.] A kind of
   buckthorn ({Rhamnus Californica}).
{Yerba mansa}. [Sp., a mild herb, soft herb.] A plant
   ({Anemopsis Californica}) with a pungent, aromatic
   rootstock, used medicinally by the Mexicans and the
   Indians.
{Yerba reuma}. [Cf. Sp. reuma rheum, rheumatism.] A low
   California undershrub ({Frankenia grandifolia}).