The Collaborative International Dictionary of English v.0.48:

Creosote bush \Cre"o*sote bush\
   A shrub (Covillea mexicana) found in desert regions from
   Colorado to California and southward through Mexico. It has
   yellow flowers and very resinous foliage with a strong odor
   of creosote.
   [Webster 1913 Suppl.] Crepance