. Bulletin (Pennsylvania Department of Forests and Waters), no. 38-39. Forests and forestry. The Ailanthus Tree in Pennsylvania. 1. 2. 3. 4. 6. 6. 7. THE AILANTHUS A mature leaf, x \i. Lower side of two leaflets showing dot-like glands, x V^. Part of panicle of flowers, x Vi. Three winged seeds, x Vi- A seedling shortly after sprouting, x Vi. Section of a winter twig showing wide pith, large leaf-scars, and small roundish budft Winter bud and leaf-scar with small clusters of bundle-scars, natural size. The Ailanthus Tree in Pennsylvania 15 trees the bark is often marked by diamond-shaped fissu
. Bulletin (Pennsylvania Department of Forests and Waters), no. 38-39. Forests and forestry. The Ailanthus Tree in Pennsylvania. 1. 2. 3. 4. 6. 6. 7. THE AILANTHUS A mature leaf, x \i. Lower side of two leaflets showing dot-like glands, x V^. Part of panicle of flowers, x Vi. Three winged seeds, x Vi- A seedling shortly after sprouting, x Vi. Section of a winter twig showing wide pith, large leaf-scars, and small roundish budft Winter bud and leaf-scar with small clusters of bundle-scars, natural size. The Ailanthus Tree in Pennsylvania 15 trees the bark is often marked by diamond-shaped fissures. On old trunks it is dark gray and sometimes black. In the fall of the year seed-bearing ailanthus trees can be distin- guished by their large seed clusters, produced in great numbers. Each seed cluster, usually from 5 to 7 inches long, carries from 500 to 1,000 seeds. Each seed consists of a little flattened nutlet surrounded by a flat, spirally twisted, paper-like wing about l^/^ inches long and one-half of an inch wide. The ailanthus has striking distinguishing characteristics at all seasons of the year, for it has few features in common with other trees. Meeting it just once means an acquaintance for life. AN ATTRACTIVE ORNAMENTAL TREE When young, the ailanthus is an attractive and distinctive orna- mental tree. In summer it is clothed with foliage of tropical luxuri- ance. In the fall of the year the seed bearing trees bear seed clusters of blushing pink against the fern-like leaf masses. This tree bears two distinct kinds of flowers, namely, staminate (male), and pistillate (female). The two kinds of flowers never occur on the same tree. Trees bearing staminate flowers should not be used for ornamental purposes, as the odor of the flowers is unpleasant. The pistillate flowers have no objectionable odor. For ornamental planting pis- tillate specimens should always be selected. Single specimens of pistillate trees, especially when young or middle aged, make an attrac- t
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