Adenostoma fasciculatum

from The Collaborative International Dictionary of English v.0.48

Chamisal \Cha`mi*sal"\, n. [Amer. Sp., fr. Sp. chamiza a kind of
   wild cane.]
   1. (Bot.) A California rosaceous shrub ({Adenostoma
      fasciculatum}) which often forms an impenetrable
      chaparral.
      [Webster 1913 Suppl.]

   2. A chaparral formed by dense growths of this shrub.
      [Webster 1913 Suppl.]