‖Hous‐to″ni‐a (?), n. [NL. So named after Dr. William Houston, an English surgeon and botanist.] (Bot.) A genus of small rubiaceous herbs, having tetramerous salveform blue or white flower. There are about twenty species, natives of North America. Also, a plant of this genus.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.