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.]