Source : Webster's Revised Unabridged Dictionary (1913)

Snakeweed \Snake"weed`\, n. (Bot.)
   (a) A kind of knotweed ({Polygonum Bistorta}).
   (b) The Virginia snakeroot. See {Snakeroot}.

Source : WordNet®

snakeweed
     n : low-growing sticky subshrub of southwestern United States
         having narrow linear leaves on many slender branches and
         hundreds of tiny yellow flower heads [syn: {rabbitweed},
         {rabbit-weed}, {broom snakeweed}, {broom snakeroot}, {turpentine
         weed}, {Gutierrezia sarothrae}]