The verse mentions one of the materials in the Mishkan was עצי שטים. Artscroll and others translate it as acacia wood.
Rashi on the pasuk quotes Midrash Tanchumah (#9) that Yaakov planted ארזים in Egypt and commanded his children to bring them with them to the wilderness. Usually ארזים is translated as cedar wood.
Which is it? Acacia or cedar?