9. =Quércus prinoìdes=, Willd. (DWARF CHESTNUT-OAK.) Much like the last, but generally grows only 2 to 4 ft. high in the Eastern States. The leaves are more wavy-toothed, on shorter stems. It seems to be only a variety of Quercus Muhlenbergii, especially in the West, where it grows much taller and runs into that species. [Illustration: Q. vìrens.] 10. =Quércus vìrens=, Ait. (LIVE-OAK.) Leaves thick, evergreen, 2 to 4 in. long, oblong, obtuse, and somewhat wrinkled; smooth and shining above, hairy beneath, the margin revolute, usually quite entire, rarely spiny-toothed. Acorns pedunculate, 1 to 3 in a cluster, oblong-ovate, with top-shaped nut. A mere shrub to a large tree, with yellowish wood of excellent grain and durability. Virginia and south. [Illustration: Q. rùbra.] 11. =Quércus rùbra, L.= (RED OAK.) Leaves rather thin, smooth, oblong, moderately pinnatifid, sometimes deeply so, into 8 to 12 entire or sharply toothed lobes, turning dark red after frost. Acorn oblong-ovoid, 1 in. or less long, set in a shallow cup of fine scales, with a narrow raised border, ¾ to 1 in. in diameter; sessile or nearly so. A large tree, 60 to 90 ft. high, with reddish, very coarse-grained wood. Common throughout. [Illustration: Q. coccínea.] 12. =Quércus coccínea=, Wang. (SCARLET OAK.) Leaves, in the ordinary form on large trees, bright green, shining above, turning red in autumn, oval or oblong, deeply pinnatifid, the 6 to 8 lobes divergent, and sparingly cut-toothed, notches rounded. Acorn ½ to ¾ in. long, roundish, depressed, one half or a little more inclosed in a top-shaped, coarsely scaled cup; in the axils of the leaf-scars of the preceding year. A large handsome tree, 60 to 80 ft. high, with grayish bark not deeply furrowed, interior reddish; coarse-grained reddish wood. Moist or dry soil. Common. [Illustration: Var. tinctória.] Var. _tinctoria_. (Quercitron. Yellow-barked or Black Oak.) Leaves, especially on young trees, often less deeply pinnatifid, sometimes barely sinuate. Foliage much like that of Quercus rubra. Acorn nearly round, ½ to 2/3 in. long, set in a rather deep, conspicuously scaly cup. Bark of trunk thicker, rougher, darker-colored and with the inner color orange. Rich and poor soil. Abundant east, but rare west. [Illustration: Q. palústris.] 13. =Quércus palústris=, Du Roi. (SWAMP, SPANISH, OR PIN OAK.) Leaves oblong, deeply pinnatifid, with divergent, sharply toothed, bristle-tipped lobes and rounded notches, and with both sides bright green. Acorn globular, hardly ½ in. long, cup shallow and saucer-shaped, almost sessile, in the axils of last year's leaf-scars. A handsome, medium-sized tree; wood reddish, coarse-grained. In low ground. Common throughout. [Illustration: Q. falcàta.]