yerba buena yĕr´bə bwā´nə [key], trailing evergreen perennial (Micromeria chamissonis) of the family Labiatae (mint family). It is native to W North America and especially common to woodland areas along the Pacific coast. Its aromatic leaves were gathered by the Native Americans of California for use in a medicinal tea. Yerba buena is classified in the division Magnoliophyta, class Magnoliopsida, order Lamiales, family Labiatae.
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