burning bush

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several shrubs or shrubby plants, such as the summer cypress and certain species of euonymus, having foliage that turns bright red in autumn.

from The Century Dictionary.

• noun The emblem adopted by the Presbyterian churches of Scotland in memory of the persecutions of the seventeenth century, and bearing the legend “Nec tamen consumebatur” (yet not consumed), in allusion to Ex. iii. 2.
• noun A name of various shrubs or plants.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun densely branched Eurasian plant; foliage turns purple-red in autumn
• noun deciduous shrub having purple capsules enclosing scarlet seeds
• noun Eurasian perennial herb with white flowers that emit flammable vapor in hot weather
• noun (Old Testament) the bush that burned without being consumed and from which God spoke to Moses