| + | Betula nigra, Linn. (B. rubra. Michx.). Red or River Birch. Tree 50-90 ft.: bark reddish brown, or silvery gray on younger branches, separating into numerous thin, papery flakes: branchlets pubescent: petioles scarcely ½in. long: Lvs. rhombic-ovate, acute, doubly serrate, pubescent when young, at length only on the veins beneath, pale or glaucescent beneath, 2-3½ in. long: cones 1-1 ⅔ in. long, cylindrical, ripening in May or June; scales pubes cent, with erect, linear-oblong, nearly equal lobes. From Mass, south to Fla. and west to Kan. and Minn. S.S. 9:452. L.B.C. 13:1248. G. F. 2:591. Gn. 55, p. 161 (habit). W. B. 63. H.T. 122, 123.— A moisture-loving, graceful tree, with slender, very numerous branches, and remarkable for its torn and ragged bark. |