The flowers, as before hinted, are thistle-shaped; the pericline or knob just under the florets is cone-shaped, covered with evenly set and pointed scales, green, edged with a brown margin, set round with short bristle-like teeth. The florets of the outer ring are 1½in. long, tubular half their length, the wider portion being five to seven cut; the centre florets are short and irregular, richly tinted with pink at their bases; the whole flower or ray, when expanded, is 3in. across. They are produced on stems over 2ft. long and of a somewhat procumbent habit, angular and branched near the tops; the leaves are 3in. to 6in. long, lance-shaped, entire and decurrent, giving the stems a winged appearance. They are of a greyish colour—nappy—whence the name Knapweed.
This vigorous species, with its white and pink varieties, may be grown in any kind of soil. It requires plenty of room; a two-year-old plant will form a specimen a yard in diameter under favourable conditions. The effect is good when all the three colours are grown near each other in bold pieces. They yield an unfailing supply of flowers, which are of a very useful type; in fact, the more they are cut the more they seem to bloom, and it is a good plan to cut short half the stems about June. They will (in a week or two) produce new shoots and large flowers in abundance, the gain being flowers of extra size during autumn.
Propagated by division of the roots any time.
Flowering period, June to September.
Centranthus Ruber.
Syn. Valeriana Ruber—Red Valerian; Nat. Ord. Valerianaceæ.
This is a strong and vigorous garden plant, with a somewhat shrubby appearance; it is herbaceous, perennial, and sometimes classed as a British species, therefore hardy; but though its classification among British plants is justifiable, it is only so on the ground of its being a naturalised subject, its original habitats being in the South of Europe. It is a favourite and "old-fashioned" flower, and it fully justifies the estimation in which it is held, the flowers being produced in large bunches of a fine rich colour, which are very durable. Its shrubby habit is not one of its least recommendations; seen at a distance—which it easily can be—it might be taken for a ruby-coloured rhododendron, to which, of course, it has no resemblance when closely inspected. It grows 2ft. high or more.
The flowers are a bright ruby colour, very small, but closely massed in great numbers, borne in corymbs, terminal and much branched; "the calyx-limb, at first revolute, afterwards expanded into a feather-like pappus;" the corolla is tubular, long, slender, and spurred; the segments or petals are small and uneven, both in form and arrangement; the germen is long; anther prominent and large for so small a flower, viz., ¾in. long and hardly ¼in. in diameter. The stems are stout, round, hollow, and glaucous; they are furnished with leaves of various shapes at the nodes, as lance-shaped, long oval, heart-shaped and plain, elliptical and pointed, wavy and notched, and arrow-shaped, lobed, and toothed. The root leaves are mostly ovate, lanceolate, and entire. The whole plant is smooth and glaucous. From the description given, it may readily be seen that when in flower it will be effective—massive heads of ruby flowers topping a shrub-like plant of shining foliage and glaucous hue. It is eminently fitted for lines or borders where other strong growers are admitted. In a cut state the flowers are very useful; they are strongly scented, something like the lilac, with just a suspicion of Valerian in it. I ought not to omit mention of its extra brightness as seen by gaslight—this fact adds much to its value for indoor decoration.
It may be grown in any kind of garden soil, needing nothing at any time in the way of special treatment; but if it is supplied with a little manure it will pay back with interest, in the form of extra-sized bunches and brighter flowers.