Source : Webster's Revised Unabridged Dictionary (1913)

Lobelia \Lo*be"li*a\ (?; 106), n. [NL. So called from Lobel,
   botanist to King James I.] (Bot.)
   A genus of plants, including a great number of species.
   {Lobelia inflata}, or Indian tobacco, is an annual plant of
   North America, whose leaves contain a poisonous white viscid
   juice, of an acrid taste. It has often been used in medicine
   as an emetic, expectorant, etc. {L. cardinalis} is the
   cardinal flower, remarkable for the deep and vivid red color
   of its flowers.

Source : WordNet®

lobelia
     n : any plant or flower of the genus Lobelia