C. PYRACANTHA.—Fiery Thorn. South Europe, 1629. This is a very distinct species, with lanceolate serrated leaves, and pinkish or nearly white flowers. The berries of this species are, however, the principal attraction, being orange-scarlet, and produced in dense clusters. C. Pyracantha crenulata and C. Pyracantha Lelandi are worthy varieties of the above, the latter especially being one of the most ornamental-berried shrubs in cultivation.
C. TANACETIFOLIA.—Tansy-leaved Thorn. Greece, 1789. This is a very late-flowering species, and remarkable for its Tansy-like foliage. It is of unusually free growth, and in almost any class of soil, and is undoubtedly, in so far at least as neatly divided leaves and wealth of fruit are concerned, one of the most distinct and desirable species of Thorn.
Other good species and varieties that may just be mentioned as being worthy of cultivation are C. apiifolia, C. Crus-galli horrida, C. orientalis, and C. tomentosum (syn C. punctata). To a lesser or greater extent, the various species and varieties of Thorn are of great value for the wealth and beauty of flowers they produce, but the above are, perhaps, the most desirable in that particular respect. They are all of free growth, and, except in waterlogged soils, thrive well and flower freely.
CYTISUS.
CYTISUS ALBUS.—White Spanish Broom. Portugal, 1752. This is a large-growing shrub of often 10 feet in height, with wiry, somewhat straggling branches, and remarkable for the wealth of pure-white flowers it produces. In May and June, if favourably situated, every branch is wreathed with small white flowers, and often to such an extent that at a short distance away the plant looks like a sheet of white. Being perfectly hardy and of very free growth in any light soil, and abundantly floriferous, this handsome shrub is one of particular value in ornamental planting. By placing three or five plants in clump-fashion, the beauty of this Broom is greatly enhanced.
C. ALDUS INCARNATUS (syn C. incarnatus) resembles C. purpureus in its leaves and general appearance, but it is of larger growth. The flowers, which are at their best in May, are of a vinous-rose colour, and produced plentifully.
C. BIFLORUS (syn C. elongatus).—Hungary, 1804. This is a dwarf, spreading, twiggy bush, of fully a yard high. Leaves trifoliolate, clothed beneath with closely adpressed hairs, and bright yellow, somewhat tubular flowers, usually produced in fours.
C. DECUMBENS.—A charming alpine species, of low, spreading growth, bright-green three-parted leaves, and bearing axillary bunches of large yellow, brownish-purple tinted flowers. A native of the French and Italian Alps, and quite hardy.
C. NIGRICANS.—Austria, 1730. Another beautiful species, with long, erect racemes of golden-yellow flowers, and one whose general hardihood is undoubted. On its own roots, and allowed to roam at will, this pretty, small-growing Broom is of far greater interest than when it is grafted mop-high on a Laburnum stem, and pruned into artificial shapes, as is, unfortunately, too often the case.
C. PURPUREUS.—Purple Broom. Austria, 1792. Alow, spreading shrub, with long wiry shoots, clothed with neat trifoliolate leaves, and bearing an abundance of its purple, Pea-shaped flowers. There is a white-flowered form, C. purpureus albus, and another named C. purpureus ratis-bonensis, with pretty yellow flowers, produced on long and slender shoots.