CARAGANA ARBORESCENS.--Siberian Pea Tree. Siberia, 1752. On account of its great hardihood, this is a very desirable garden shrub or small-growing tree. The bright-yellow, pea-shaped flowers are very attractive, while the deep-green, pinnate foliage imparts to the tree a somewhat unusual but taking appearance. Soil would not seem to be of much moment in the cultivation of this, as, indeed, the other species of Caragana, for it thrives well either on dry, sunny banks, where the soil is light and thin, or in good stiff, yellow loam. C. FRUTESCENS.--Siberia, 1852. Flowers in May, and is of partially upright habit; while C. Chamlagii, from China, has greenish-yellow flowers, faintly tinted with pinky-purple. C. MICROPHYLLA (_syn C. Altagana_), also from Siberia, is smaller of growth than the foregoing, but the flowers are individually larger. It is readily distinguished by the more numerous and hairy leaflets and thorny nature. C. SPINOSA.--Siberia, 1775. This, as the name indicates, is of spiny growth, and is a beautiful and distinct member of the family. They are all hardy, and readily propagated from seed. CARDIANDRA. CARDIANDRA ALTERNIFOLIA.--Japan, 1866. With its neat habit, and pretty purple-and-white, plentifully-produced flowers, this is worthy of the small amount of care and coddling required to insure its growth in this country. Hailing from Japan, it cannot be reckoned as very hardy, but treated as a wall plant this pretty evergreen does well and flowers freely. It can, however, be said that it is equally hardy with some of the finer kinds of Hydrangea, to which genus it is nearly allied. CARPENTERIA. CARPENTERIA CALIFORNICA.--Sierra Nevada, California, 1880. This is undoubtedly one of the most distinct and beautiful of hardy shrubs. That it is perfectly hardy in England and Ireland recently-conducted experiments conclusively prove, as plants have stood unprotected through the past unusually severe winters with which this country has been visited. When in full bloom the pure-white flowers, resembling those of the Japanese Anemone, render it of great beauty, while the light gray leaves are of themselves sufficient to make the shrub one of particular attraction. The Carpenteria is nearly related to the Mock Orange (Philadelphus), grows about 10 feet in height, with lithe and slender branches, and light gray leaves. The flowers, which are pure white with a bunch of yellow stamens, and sweet-scented, are produced usually in fives at the branch-tips, and contrast markedly with the long and light green foliage. It grows and flowers with freedom almost anywhere, but is all the better for wall protection. From cuttings or suckers it is readily increased. CARYOPTERIS.