from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An evergreen shrub of the genus Purshia, especially P. tridentata of western North America, having bitter-tasting leaves with fuzzy undersides that are nutritious for deer, elk, and antelope.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any member of the genus Purshia of flowering shrubs, native to western North America.
bitter + brush (Wiktionary)