Exodus 3:2
And the angel of the LORD appeared unto him in a flame of fire out of the midst of a bush: and he looked, and, behold, the bush burned with fire, and the bush was not consumed
I think it was this bush
DICTAMNUS (Dictam'nus)
DESCRIPTION: These hardy perennials are originally from southwest Europe, south and central Asia, Korea and China. These plants are commonly called Burning Bushes because, in arid weather, a flammable oil exudes from the leaves and seedpods and if a flame is placed near, will sometimes ignite without damaging the plant. Other common names include Gas Plant, Dittany and Fraxinella. D. albus is an erect plant growing up to 3 feet high with a spread of 2 feet. The fragrant, light green leaves are divided in lance-shaped leaflets. Its star-shaped flowers are also scented; they are borne in racemes in early summer and are white with noticeable stamens. D. albus var. purpureus resembles D. albus, but has pale to deep purplish-pink flowers also with conspicuous stamens. The leaves are very aromatic.
From
http://www.botany.com/dictamnus.html
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