Weight of Seasoned Wood in Pounds per Cubic Foot. 50 (U. S. Forestry Div.).[18] 52. Modulus of Elasticity. 2,030,000 (average of 49 tests by U. S. Forestry Div.).[18] 1,180,000. Modulus of Rupture. 12,300 (average of 49 tests by U. S. Forestry Div.).[18] 12,900. Remarks. Most common and widely distributed oak in Gulf States west of the Mississippi River. Obtusiloba, the Latin for blunt-lobed, refers to the shapes of the leaves. Wood seldom commercially distinguished from white oak. [p017] FOOTNOTE [Footnote 18: See page 6.] BUR OAK. _Quercus macrocarpa Michx._ Nomenclature. (Sudworth.) Bur Oak (local and common name). Overcup Oak (R. I., Del., Pa., Miss., La., Ill., Minn.). Mossycup White Oak (Minn.). Mossycup Oak (Mass., Pa., Del., Miss., La., Tex., Ark., Ill., Iowa, Neb., Kan.). Scrub Oak (Neb., Minn.). Overcup White Oak (Vt.). Locality. New Brunswick, New England, westward intermittently to Montana and Texas. Features of Tree. Seventy to one hundred and thirty feet in height, five to seven feet in diameter. Deep opposite depressions to leaves. Mossy, fringed border at top of acorn-cup. Corky wings on young branches. Color, Appearance, or Grain of Wood. Heartwood rich brown, sapwood lighter, close-grained, broad conspicuous medullary rays. Structural Qualities of Wood. Heavy, hard, strong, tough, very durable in contact with ground. Representative Uses of Wood. Similar to those of Quercus alba. Weight of Seasoned Wood in Pounds per Cubic Foot. 46.00. Modulus of Elasticity. 1,320,000. Modulus of Rupture. 13,900. Remarks. Extends farthest west and northwest of any other Eastern oak. Especially recommended for prairie planting. [p018] WHITE OAK. _Quercus garryana Douglas._ Nomenclature. (Sudworth.) White Oak (Cal., Oreg.). Pacific Post Oak (Oreg.). Western White Oak (Oreg.). Oregon White Oak (Cal.). California Post Oak. Locality. Pacific coast, British Columbia into California. Features of Tree. Sixty to ninety feet high, one and one half to two and one half feet in diameter. A small shrub at high elevations. Color, Appearance, or Grain of Wood. Heartwood light brown or yellow. Sapwood lighter, often nearly white. Compact structure. Distinctly marked annual rings. Medullary rays often conspicuous. Structural Qualities of Wood. Heavy, strong, hard, tough. Representative Uses of Wood. Ship-building, carriages, furniture, indoor decoration, fuel. Weight of Seasoned Wood in Pounds per Cubic Foot. 46. Modulus of Elasticity. 1,150,000. Modulus of Rupture. 12,400. Remarks. Locally important. The best substitute for Eastern White Oak produced on Pacific coast. [p019] RED OAK. _Quercus rubra Linn._ Nomenclature. (Sudworth.) Red Oak (local and common name). Black Oak (Vt., Conn., N. Y., Wis., Ia., Neb., So. Dak., Ont.). Spanish Oak (Pa., N. C.). Locality.