_Chrysanthemum._--Apart from the florist's varieties of _C. indicum_ there are a few fine natural species. One of the best for the flower border is _C. maximum_ and its varieties--all with beautiful white flowers having yellow centres. _C. latifolium_ is also a fine species.
_Colchicum._--Showy autumn-blooming bulbs (corms), with crocus-like flowers, all rosy-purple or white. _C. speciosum_, _C. autumnale_, single and double, _C. byzantinum_, and _C. variegatum_ are all worth growing.
_Convallaria._--_C. majalis_, the lily of the valley, a well-known sweet-scented favourite spring flower, growing freely in rich garden soil; its spikes, 6 to 9 in. high, of pretty white fragrant bells, are produced in May and June. Requires shady places, and plenty of old manure each autumn.
_Coreopsis._--Effective composite plants, thriving in good garden soil. _C. auriculata_, 2 to 3 ft., has yellow and brown flowers in July and August; _C. lanceolata_, 2 to 3 ft., bright yellow, in August; next to the biennial _C. grandiflora_ it is the best garden plant.
_Corydalis._--Interesting and elegant plants, mostly tuberous, growing in good garden soil. _C. bracteata_, 9 in., has sulphur-coloured flowers in April, and _C. nobilis_, 1 ft., rich yellow, in May; _C. solida_, with purplish, and _C. tuberosa_, with white flowers, are pretty spring-flowering plants, 4 to 6 in. high. _C. thalictrifolia_, 1 ft., yellow, May to October.
_Cyclamen._--Charming tuberous-rooted plants of dwarf habit, suitable for sheltered rockeries, and growing in light gritty soil. _C. europaeum_, reddish-purple, flowers in summer, and _C. hederae-folium_ in autumn.
_Cypripedium._--Beautiful terrestrial orchids, requiring to be planted in peat soil, in a cool and rather shady situation. _C. spectabile_, 1½ to 2 ft., white and rose colour, in June, is a lovely species, as is _C. Calceolus_, 1 ft., yellow and brown, in May; all are full of interest and beauty.
_Delphinium._--The Larkspur family, tall showy plants, with spikes of blue flowers in July. Distinct sorts are _D. grandiflorum_ and _D. grandiflorum flore-pleno_, 2 to 3 ft., of the richest dazzling blue, flowering on till September; _D. chinense_, 2 ft., blue, and its double-flowered variety, are good, as is _D. Barlowi_, 3 ft., a brilliant double blue-purple. _D. nudicaule_, 2 ft., orange-scarlet, very showy, is best treated as a biennial, its brilliant flowers being produced freely in the second year from the seed.