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 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 SCANDENS.--Climbing Waxwork, or Bitter Sweet. North America, 1736. When planted in rich, moist soil, this soon forms an attractive mass of twisting and twining growths, with distinct glossy foliage in summer and brilliant scarlet fruit in autumn. The flowers are inconspicuous, the chief beauty of the shrub being the show of fruit, which resembles somewhat those of the Spindle Tree (Euonymus), and to which it is nearly allied. A native of North America, it grows from 12 feet to 15 feet high, and is useful in this country for covering arches or tree stems, or for allowing to run about at will on a mound of earth or on rockwork.