CARYOPTERIS.
CARYOPTERIS MASTACANTHUS.—China and Japan, 1844. This is a neat-growing Chinese shrub, and of value for its pretty flowers that are produced late in the autumn. It must be ranked as fairly hardy, having stood through the winters of Southern England unprotected; but it is just as well to give so choice a shrub the slight protection afforded by a wall. The leaves are neat, thickly-arranged, and hoary, while the whole plant is twiggy and of strict though by no means formal growth. Flowers lavender-blue, borne at the tips of the shoots, and appearing in succession for a considerable length of time. Light, sandy peat would seem to suit it well, at least in such it grows and flowers freely.
CASSANDRA.
CASSANDRA CALYCULATA (syn Andromeda calyculata).—North America, 1748. This is a handsome species from the Virginian swamps, but one that is rarely seen in a very satisfactory condition in this country. It grows about 18 inches high, with lanceolate dull-green leaves, and pretty pinky-white flowers, individually large and produced abundantly. For the banks of a pond or lake it is a capital shrub and very effective, particularly if massed in groups of from a dozen to twenty plants in each. There are several nursery forms, of which A. calyculata minor is the best and most distinct.
CASSINIA.
CASSINIA FULVIDA (syn Diplopappus chrysophyllus).—New Zealand. This is a neat-growing and beautiful shrub, the rich yellow stems and under sides of the leaves imparting quite a tint of gold to the whole plant. The flowers are individually small, but the whole head, which is creamy-white, is very effective, and contrasts strangely with the golden sheen of this beautiful shrub. It is inclined to be of rather upright growth, is stout and bushy, and is readily increased from cuttings planted in sandy soil in the open border. Probably in the colder parts of the country this charming shrub might not prove perfectly hardy, but all over England and Ireland it seems to be quite at home. The flowers are produced for several months of the year, but are at their best about mid-November, thus rendering the shrub of still further value. It grows freely in sandy peaty soil of a light nature.
CASSIOPE.
CASSIOPE FASTIGIATA (syn Andromeda fastigiata) and C. TETRAGONA (syn Andromeda tetragona) are small-growing species, only suitable for rock gardening—the former of neat upright habit, with large pinky-white bells all along the stems; and the latter of bushy growth, with square stems and small white flowers.
CASTANEA.
CASTANEA SATIVA (syn C. vesca and C. vulgaris).—Sweet Spanish Chestnut. Asia Minor. Few persons who have seen this tree as an isolated specimen and when in full flower would feel inclined to exclude it from our list. The long, cylindrical catkins, of a yellowish-green colour, are usually borne in such abundance that the tree is, during the month of June, one of particular interest and beauty. So common a tree needs no description, but it may be well to mention that there are several worthy varieties, and which flower almost equally well with the parent tree.
CATALPA.
CATALPA BIGNONIOIDES.—Indian Bean. North America, 1798. When in full bloom this is a remarkable and highly ornamental tree, the curiously-marked flowers and unusually large, bronzy-tinted foliage being distinct from those of almost any other in cultivation. That it is not, perhaps, perfectly hardy in every part of the country is to be regretted, but the numerous fine old specimens that are to be met with all over the country point out that there need be little to fear when assigning this pretty and uncommon tree a position in our parks and gardens. The flowers, produced in spikes at the branch-tips, are white, tinged with violet and speckled with purple and yellow in the throat. Individually the flowers are of large size and very ornamental, and, being produced freely, give the tree a bright and pleasing appearance when at their best. Usually the tree attains to a height of 30 feet in this country, with rather crooked and ungainly branches, and large heart-shaped leaves that are downy beneath. It flourishes well on any free soil, and is an excellent smoke-resisting tree. C. bignonioides aurea is a decided variety, that differs mainly in the leaves being of a desirable golden tint.
C. BUNGEI and C. KAEMPFERI, natives of China and Japan, are hardly to be relied upon, being of tender growth, and, unless in the most favoured situations, suffer from our severe winters. They resemble our commonly cultivated tree.
C. SPECIOSA.—United States, 1879. The Western Catalpa is more erect and taller of growth than C. bignonioides. The flowers too are larger, and of purer white, and with the throat markings of purple and yellow more distinct and not inclined to run into each other. Leaves large, heart-shaped, tapering to a point, of a light pleasing green and soft to the touch. It flowers earlier, and is more hardy than the former.
CEANOTHUS.
CEANOTHUS AMERICANUS.—New Jersey Tea. North America, 1713. A shrub of 4 feet in height, with deep green serrated leaves, that are 2 inches long and pubescent on the under sides. Flowers white, in axillary panicles, and produced in great abundance. This is one of the hardiest species, but succeeds best when afforded wall protection.
C. AZUREUS.—Mexico, 1818. This species, though not hardy enough for every situation, is yet sufficiently so to stand unharmed as a wall plant. It grows from 10 feet to 12 feet high, with deep-green leaves that are hoary on the under sides. The flowers, which are borne in large, axillary panicles, are bright blue, and produced in June and the following months. In a light, dry soil and sunny position this shrub does well as a wall plant, for which purpose it is one of the most ornamental. There are several good nursery forms, of which the following are amongst the best:—C. azureus Albert Pettitt, C. azureus albidus, C. azureus Arnddii, one of the best, C. azureus Gloire de Versailles, and C. azureus Marie Simon.
C. CUNEATUS (syn C. verrucosus).—California, 1848. This is another half-hardy species that requires wall protection, which may also be said of C. Veitchianus, one of the most beautiful of the family, with dense clusters of rich blue flowers and a neat habit of growth.
C. DENTATUS.—California, 1848. With deeply-toothed, shining-green leaves, and deep blue, abundantly-produced flowers, this is a well-known wall plant that succeeds in many parts of the country, particularly within the influence of the sea. It commences flowering in May, and frequently continues until frosts set in. It is a very desirable species, that in favoured situations will grow to fully 10 feet high, and with a spread laterally of nearly the same dimensions.
C. PAPILLOSUS.—California, 1848. This is a straggling bush, with small, blunt leaves, and panicles of pale blue flowers on long footstalks. A native of California and requiring wall protection.
C. RIGIDUS.—Another Californian species, is of upright, stiff growth, a sub-evergreen, with deep purple flowers produced in April and May.
There are other less hardy kinds, including C. floribundus, C. integerrimus, C. velutinus, and C. divaricatus.
CEDRELA.
CEDRELA SINENSIS (syn Ailanthus flavescens).—China, 1875. This is a fast growing tree, closely resembling the Ailanthus, and evidently quite as hardy. It has a great advantage over that tree, in that the flowers have an agreeable odour, those of the Ailanthus being somewhat sickly and unpleasant. The flowers are individually small, but arranged in immense hanging bunches like those of Koelreuteria paniculata, and being pleasantly scented are rendered still the more valuable. The whole plant has a yellow hue, and the roots have a peculiar reddish colour, and very unlike those of the Ailanthus, which are white.
CELASTRUS.