_Campanula Medium calycanthema_: hardy, 2 ft., blue or white; hose-in-hose flowered.
_Catananche coerulea_: hardy, 2 to 3 ft., blue or white.
_Celsia cretica_: hardy, 4 to 5 ft., yellow, with two dark spots near centre; in spikes.
_Cheiranthus Cheiri_ (Wallflower): hardy, 1½ to 2 ft., red, purple, yellow, &c.; really a perennial but better as a biennial.
_Coreopsis grandiflora_: hardy, 2 to 3 ft., bright yellow; the finest member of the genus.
_Dianthus barbatus_ (Sweet William): hardy, 1 to 1½ ft., crimson, purple, white or parti-coloured.
_Dianthus chinensis_ (Indian Pink): half-hardy, 1 ft., various; flower earlier if treated as biennials; must be protected from frost.
_Digitalis purpurea_ (Foxglove): hardy, 3 to 5 ft., rosy-purple or white; beautifully spotted; the variety called _gloxinioides_ has regular, erect flowers.
_Echium pomponium_: hardy, 4 ft., rosy-pink.
_Hedysarum coronarium_ (French Honeysuckle): hardy, 2 to 3 ft., scarlet or white; fragrant.
_Hesperis tristis_ (Night-scented Rocket): hardy, 3 ft., dull purplish; fragrant at night.
_Lunaria biennis_ (Honesty): hardy, 2 to 3 ft., purple; the silvery dissepiment attractive among everlastings.
_Matthiola incana_ (two groups, the Brompton and the Queen stocks): hardy, 2 to 2½ ft., white, red and purple.
_Meconopsis._ Charming members of the poppy family, of which _M. aculeata_, purple; _M. grandis_, purple; _M. heterophylla_, coppery-orange; _M. nepalensis_, golden yellow; _M. integrifolia_, yellow; _M. simplicifolia_, violet purple, are grown with care in sheltered spots, and in rich, very gritty soil.
_Michauxia campanuloides_, a remarkable bell flower, 3 to 8 ft. high, white tinged purple. Requires rich loam in warm sheltered spots.
_Oenothera biennis_ and _O. Lamarckiana_ (Evening primrose): hardy, 5 ft., bright yellow; large.
_Scabiosa caucasica_: hardy, 3 ft., blue, white.
_Silene compacta_: half-hardy, 3 to 6 inches, bright pink; clustered as in S. Armeria.
_Verbascum Blattaria_: hardy, 3 to 4 ft., yellowish, with purple hairs on the filaments; in tall spikes.
HARDY HERBACEOUS PERENNIALS.--This term includes not only those fibrous-rooted plants of herbaceous habit which spring up from the root year after year, but also those old-fashioned subjects known as florists' flowers, and the hardy bulbs. Some of the most beautiful of hardy flowering plants belong to this class. When the length of the flowering season is considered, it will be obvious that it is impossible to keep up the show of a single border or plot for six months together, since plants, as they are commonly arranged, come dropping into and out of flower one after another; and even where a certain number are in bloom at the same time, they necessarily stand apart, and so the effects of contrast, which can be perceived only among adjacent objects, are lost. To obviate this defect, it has been recommended that ornamental plants should be formed into four or five separate suites of flowering, to be distributed over the garden. Not to mention the more vernal flowers, the first might contain the flora of May; the second that of June; the third that of July; and the fourth that of August and the following months. These compartments should be so intermingled that no particular class may be entirely absent from any one quarter of the garden.