Hardy Ornamental Flowering Trees and Shrubs · Chapter 31Caragana
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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.