File:Bulletin (Pennsylvania Department of Forestry), no. 11 (1901) (20315777119).jpg

Title: Bulletin (Pennsylvania Department of Forestry), no. 11
Identifier: bulletinpennsylv11pennx (find matches)
Year: 1901 (1900s)
Authors: Pennsylvania. Dept. of Forestry
Subjects: Forests and forestry
Publisher: Harrisburg, Pa. : The Department : WM. Stanley Ray, state printer of Pennsylvania
Contributing Library: Penn State University
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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104 ,» 111! DOWNY POPLAR Populus herterophylla, Linnaeus FOSlt—In the north usually a small tree from 30-50 ft. high; In the south may reach a height of 100 ft. with a diameter of 3 ft. C5rown high, rather broad and round-topped. Trunk short, continuous, and tapering. BABK—On old trunks thick, light reddish-brown, rough, broken by long fissures into long narrow plates. On younger trunks and large branches thinner, not so rough; fissures shallower and ridges smoother than on old trunks. TWIQS—Stout, light yellowish, marked by a few scattered pale lentlcels, roughened by elevated leaf-scars; pith orange-colored. BXrSS—Alternate, broadly ovate, slightly resinous, bright reddish-brown, covered with 4-7 (;cales which are slightly pubescent towards the base. Leaf-buds about i of an inch long. Flower-bods about i of an inch long. LEAy£S—Alternate, simple, broadly ovate, cordate, rounded or truncate at base, rounded or acute at apex, coarsely serrate on margin, 4-7 inches long, dark green above, pale green below; leaf-stalks ivund. LEAF-SCABS—Alternate, large, elevated, often 3-lobed, indented on upper margin; with 8 conspicuous bundle-scars. FLOWEBS—Appear in March or April. In general similar to the Cottonwood, only both staminate and pistillate amenta are shorter. FBTJII—^A drooping ament, when mature about 4-6 inches long, bearing a few scattered, dark green, 3-4 valved capsules containing small seeds surrounded by a mat of white hairs. WOOD—Same as that of the Cottonwood only slightly heavier. See description page 106. DISTINGXnSHIirG OHABAOTEBISTICS—The Downy Poplar, also known as Swamp Cotton- wood, Black Cottonwood, River Cottonwood, and Swamp Poplar, may be distinguished from all the Aspens, Poplars, and Cottonwoods native to this State by its round leaf-stalks. The leaf-stalks of all the others are laterally flattened. The leaves are large and more bluntly pointed than those of the other species. The leaf-margins are not so finely toothed as those of the American Aspens but finer than the other two native species. The bark on old trunks is light reddish-brown. The twigs are stouter than those of the Aspens and contain orange colored pith. The Aspens have white pith. The buds are bright reddish-brown, slightly resinous, covered with scales which are often pubescent near the base. BAHOE—Connecticut along coast to (Georgia, west to Louisiana, and northward to Kentucky and Missouri. Its range suggests a somewhat contorted horseshoe. DISTBIBTJTION IK PEKHSTLVAiriA—Reported from Chester, Delaware and Franklin countiec. Yery rare and local. Recent investigations Indicate that this tree is probably not native to the State. HABITAT—Found only in low and wet situations, and always mixed with other species in this State. IMFOBTAKCE OF THE SPECIES—The Downy Poplar is too rare and local to be of any com- mercial importance. It is not attractive ornamentally on account of its heavy limbs and sparse, rounded crown. The wood is not listed separately on the market but bought and sold as Cotton- wood.
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PLATE XXXIV. DOWNY POPLAR 1. A staminate flowering branch, x J. 2. A staminate flower, enlarged. 3. A pistillate flowering branch, x ). 4. A pistillate flower, enlarged. .... , i .'). Section of a branch with a fruiting catkin and cnpsulos, x ). 6. A seed with hairs, enlarged. 7. Section of a branch with mature foliage, x J. 8. A winter twig, x i. 8. Section of a winter twig, enlarged. INTENTIONAL SECOND EXPOSURE

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