In which Jehovah appeared to Moses in the wilderness (Exodus 3:2; Acts 7:30). It is difficult to say what particular kind of plant or bush is here meant. Probably it was the mimosa or acacia. The words "in the bush" in Mark 12:26; Luke 20:37, mean "in the passage or paragraph on the bush;" i.e., in Exodus 3.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Bush'". "Easton's Bible Dictionary".