snakeweed

from WordNet (r) 3.0 (2006)

snakeweed
    n 1: 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}, {snakeweed}, {broom snakeweed}, {broom
         snakeroot}, {turpentine weed}, {Gutierrezia sarothrae}]

from The Collaborative International Dictionary of English v.0.48

Snakeweed \Snake"weed`\, n. (Bot.)
   (a) A kind of knotweed ({Polygonum Bistorta}).
   (b) The Virginia snakeroot. See {Snakeroot}.
       [1913 Webster]