. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 109 m PLATE XXXVII. BLACK WALNUT. 1 Branch with devtlopinK and (s) thrco s. ratkins ..f staniinate flowers and (P) a spike with three pistillate flowers, x A. 2 A staminate flower, slightly enlarged. 3. A pistillate flower, slightly enlarged. 4. A branch with a mature leaf and trult, x J. scars and notched upper surface, slightly enlarged, o: TeSlllnS'^S or^Slater^tiig showing and tcmilnal bud with bud-scales, slightly eularged. BLACK WALNUT Juglans nigra, Linnaeus FORM—A large tree, uwiaUy
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. 109 m PLATE XXXVII. BLACK WALNUT. 1 Branch with devtlopinK and (s) thrco s. ratkins ..f staniinate flowers and (P) a spike with three pistillate flowers, x A. 2 A staminate flower, slightly enlarged. 3. A pistillate flower, slightly enlarged. 4. A branch with a mature leaf and trult, x J. scars and notched upper surface, slightly enlarged, o: TeSlllnS'^S or^Slater^tiig showing and tcmilnal bud with bud-scales, slightly eularged. BLACK WALNUT Juglans nigra, Linnaeus FORM—A large tree, uwiaUy attalntasr a height of 80-100 ft. with a diameter of 2-3 ft but may reach a height of 180 ft. with a diameter of 6-8 feet. Trunk usually straight clean slightly tapering, bearing a round-topped crown. ' ' BAEK—Seml-flbrous, thick, rough, longitudinally and occasionally dlagonaUy Assured Outer bark dark brown to grayish-black. Inner bark light colored, but turns yellow upon exposure. See fjg. 102. TWiaS—nAt first hairy, later smooth, orange-brown to dark brown, stOMt, covered with rather Inconspicuous, Bomewhat raised lenticels; pith light brown, chambered. BUDS—Alternate, covered with thick, pubescent scales. Terminal buds usually less than i of an inch long, flattened, ovate, blunt-pointed. Lateral buds usually less than 1/6 of an inch long, obtuse at apex, often superposed. LEAVES—Alternate, compound with 13-23 leaflets. Leaflets 8-4 inches long, oblique at base, acute at apex, serrate on margin, almost sessile and arranged opposite or alternate to each other. LEAF-SCABS—Alternate, large, 3-lobed, often heart-sliaped, raised; upper margin notched In which an axillary bud is often located. Bundle-scars grouped in three clusters, arranged in a U-shaped line. FI/)WEXS—Appear in May when the leaves are about half-developed. Staminate and pis- tillate flowers are separate, but occur on same tree and usually on same branch. Staminate arranged in unbranched catkins. P
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectforests, bookyear1901
