. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Tree of Heaven 5^7 III. TREE OF HEAVEN GENUS AILAirrHnS DESFONTAINES Species Ailanthus glandulosa Desfontaines EVEN species of Ailanthus are known, all natives of eastern Asia; they are trees with odd-pinnate leaves and large panicles of small greenish- white flowers, the pistillate ones followed by drooping clusters of nar- row samaras. The generic name is modified from an Asiatic name of this tree. Ailanthus glandulosa,
. North American trees : being descriptions and illustrations of the trees growing independently of cultivation in North America, north of Mexico and the West Indies . Trees. Tree of Heaven 5^7 III. TREE OF HEAVEN GENUS AILAirrHnS DESFONTAINES Species Ailanthus glandulosa Desfontaines EVEN species of Ailanthus are known, all natives of eastern Asia; they are trees with odd-pinnate leaves and large panicles of small greenish- white flowers, the pistillate ones followed by drooping clusters of nar- row samaras. The generic name is modified from an Asiatic name of this tree. Ailanthus glandulosa, which is the generic type, is a native of China, known also as Chinese sumac, but has become so perfectly established in parts of the northeastern United States and Ontario as to appear like an element of the natu- ral flora, growing not only along roads and near habitations, but often in woods and wild thickets, spreading freely both by suckers and seeds. It sometimes be- comes 30 meters high, with a trunk up to a meter in diameter. The bark is thin, gray, slightly roughened, that of yoxmg branches and shoots quite smooth. The leaves are from 3 to 10 dm. long, stalked, smooth, with 13 to 41 short-stalked pointed leaf- lets, which are ovate to ovate-lanceolate, entire-margined or with i to 4 blunt teeth near the heart-shaped or truncate base, thin in texture and wilting at once after the leaf is picked. The individual flowers are only about 6 mm. broad, but exceedingly numerous; the calyx is 5-lobed, the petals 5, valvate, spreading, the disk lo-lobed, and the unpleasantly scented staminate ones have 10 stamens; the ovary in the pistillate ones is deeply 2-lobed to 5-lobed. The samaras are linear, veiny, twisted, about 5 cm. long, thin, bearing the seed at about the middle. The free growth by suckers makes this a weed-tree, often very djfiicult to eradi- cate, coming up year after year even when ruthlessly cut down, and growing 2 or 3 meters high in a season. The wood is nearl
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