The Hebrew word seneh occurs only in those passages which refer to Jehovah’s appearance to Moses "in the flame of fire in the bush." (Exodus 3:2,3,4; 33:16) It is quite impossible to say what kind of thorn bush is intended; but it was probably the acacia a small variety of the shittim tree found in the Sinai region.
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Smith, William, Dr. "Entry for 'Bush'". "Smith's Bible Dictionary".