. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. m. PLATE CI. TREE OF HEAVEN 1. A maturt' leaf, x J. L:. Lower side of two It-aflcls showing glands, x J. A panide of flowers, x i. 4. ' >. 0. 7. A siiiaU cluster i)f winged si'cds, x J. A sfedling. x A. A winter twig, x i. A bud and a loaf-scar with bundlc-scarH, natural size. 193 TREE OF HEAVEN Ailanthus glandulosa, Desfontaines FAMILY AND GENUS DESCRIPTION—The Quaasia family, Simarubaceae, coiiipriseH about 30 genera witli 150 siKM-ies found mostly in the tropics and the warmer parts of both the eastern and we
. Bulletin (Pennsylvania Department of Forestry), no. 11. Forests and forestry. m. PLATE CI. TREE OF HEAVEN 1. A maturt' leaf, x J. L:. Lower side of two It-aflcls showing glands, x J. A panide of flowers, x i. 4. ' >. 0. 7. A siiiaU cluster i)f winged si'cds, x J. A sfedling. x A. A winter twig, x i. A bud and a loaf-scar with bundlc-scarH, natural size. 193 TREE OF HEAVEN Ailanthus glandulosa, Desfontaines FAMILY AND GENUS DESCRIPTION—The Quaasia family, Simarubaceae, coiiipriseH about 30 genera witli 150 siKM-ies found mostly in the tropics and the warmer parts of both the eastern and western hemispheres. Three genera, eaeli with 1 tree species, are native to the southern part of the United States. A single species of a fourth genus has been introduced from China. This genus, Ailanthus, contains 7 species all native to eastern Asia. No member of this family is native to Pennsylvania. FORM—May reach a height of 100 ft. with a diameter of 3 ft., but usually much smaller. Trunk usually short, but sometimes long, bearing stout branches with few branchlcts. CJrown wide, high, and flat-topped. BARK—On younger trunks smooth, thin, light gray sometimes roughened with Assures. Ridges usually dark and stand in strong contrast with the light Assures. On old trunks thin, close, roughened with diamond-shaped Assures, dark gray and sometimes black. See Fig. 120. TWIGS—Stout, clumsy, yellowish-green to reddish-brown, covered with a Ane velvety down, and numerous, longitudinally-elongated, ochre-colored, scattered lentlcels. Pith large, rathtr hard, light brown. When broken or crushed the twigs give forth a rank smell. Longitudinal strlations may appear after outer covering of twigs scales off. BUDS—Alternate; terniinal bud absent; false terminal bud often present; reddish-brown, downy, about 1/8-1/6 of an inch long, located in notch of upper surface of the leaf-scar, covered with scales; the two outer scales do not quite cover the bud, hence they have a narrow slit
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectforests, bookyear1901
