Dictionary
Shittah-tree
(Isa. 41:19; R.V., "acacia tree"). Shittah wood was employed in making the various parts of the tabernacle in the wilderness, and must therefore have been indigenous in the desert in which the Israelites wandered. It was the acacia or mimosa (Acacia Nilotica and A. seyal). "The wild acacia (Mimosa Nilotica), under the name of sunt, everywhere represents the seneh, or senna, of the burning bush. A slightly different form of the tree, equally common under the name of seyal, is the ancient 'shittah,' or, as more usually expressed in the plural form, the 'shittim,' of which the tabernacle was made." Stanley's Sinai, etc. (Ex. 25:10, 13, 23, 28).
Dictionary
Acacia
(Heb. shittim) Ex. 25:5, R.V. probably the Acacia seyal (the gum-arabic tree); called the "shittah" tree (Isa. 41:19). Its wood is called shittim wood (Ex. 26:15, 26; 25:10, 13, 23, 28, etc.). This species (A. seyal) is like the hawthorn, a gnarled and thorny tree. It yields the gum-arabic of commerce. It is found in abundance in the Sinaitic peninsula.
Dictionary
Oil-tree
(Isa. 41:19; R.V. marg., "oleaster"), Heb. etz shemen, rendered "olive tree" in 1 Kings 6:23, 31, 32, 33 (R.V., "olive wood") and "pine branches" in Neh. 8:15 (R.V., "branches of wild olive"), was some tree distinct from the olive. It was probably the oleaster (Eleagnus angustifolius), which grows abundantly in almost all parts of Palestine, especially about Hebron and Samaria. "It has a fine hard wood," says Tristram, "and yields an inferior oil, but it has no relationship to the olive, which, however, it resembles in general appearance."