=Inflorescence.=--Late May or early June. Showy and abundant, in loose, pendent, axillary racemes; calyx short, bell-shaped, 5-cleft, the two upper segments mostly coherent; corolla shaped like a pea blossom, the upper petal large, side petals obtuse and separate; style and stigma simple. =Fruit.=--A smooth, dark brown, flat pod, about 3 inches long, containing several small brown flattish seeds, remaining on the tree throughout the winter. =Horticultural Value.=--Hardy throughout New England in all dry, sunny situations, of rapid growth, spreading by underground stems, ordinarily short-lived and subject to serious injury by the attacks of borers. Occasionally procurable in large quantities at a low rate. In Europe there are many horticultural forms, a few of which are occasionally offered in American nurseries. The type is propagated from seed, the forms by grafting. [Illustration: PLATE LXVII.--Robinia Pseudacacia.] 1. Winter buds. 2. Flowering branch. 3. Flower with corolla removed. 4. Fruiting branch. =Robinia viscosa, Vent.= CLAMMY LOCUST. This tree appears to be sparingly established in southern Canada and at many points throughout New England. Common in cultivation and occasionally established through the middle states; native from Virginia along the mountains of North Carolina, South Carolina, and Georgia. Easily distinguished from _R. Pseudacacia_ by its smaller size, glandular, viscid branchlets, later period of blossoming, and by its more compact, usually upright, scarcely fragrant, rose-colored flower-clusters. SIMARUBACEAE. AILANTHUS FAMILY. =Ailanthus glandulosus, Desf.= AILANTHUS. TREE-OF-HEAVEN. CHINESE SUMAC. Sparsely and locally naturalized in southern Ontario, New England, and southward. A native of China; first introduced into the United States on an extensive scale in 1820 at Flushing, Long Island; afterwards disseminated by nursery plants and by seed distributed from the Agricultural Department at Washington. Its rapid growth, ability to withstand considerable variations in temperature, and its dark luxuriant foliage made it a great favorite for shade and ornament. It was planted extensively in Philadelphia and New York, and generally throughout the eastern sections of the country. When these trees began to fill the ground with suckers and the vile-scented sterile flowers poisoned the balmy air of June and the water in the cisterns, occasioning many distressing cases of nausea, a reaction set in and hundreds of trees were cut down. The female trees, against the blossoms of which no such objection lay, were allowed to grow, and have often attained a height of 50-75 feet, with a trunk diameter of 3-5 feet. The fruit is very beautiful, consisting of profuse clusters of delicate pinkish or greenish keys.