Encyclopaedia of Gardening 87 



Coronilla, Crown Vetch (coromll-a, from corona, a crown, alluding 

 to the arrangement of the flowers. Ord. Leguminosae) . The most 

 popular member of this genus is glauca, a greenhouse evergreen 

 shrub, bearing yellow flowers in late spring (see the Botanical 

 Magazine, t. 13); it grows 2 to 3 ft. high; variegata (Bot. 

 Mag., t. 2179) is a garden form of it. They like loam, with a 

 fourth of peat and some sand. Propagation is by cuttings under 

 a bell-glass. Cappadocica (syn. iberica), cream flowers in summer 

 (Bot. Mag., t. 2646); and varia, pink (Bot. Mag., t. 258), are hardy 

 trailers suitable for the rockery; they like loam, peat, and gri 



Corydalis, Fumitory (coryd-alis, from korydalos, a lark, in allusion 

 to the spur resembling a lark's. Ord. Fumariaceae) . A useful 

 genus, as the plants will thrive in dry limestone soils, but C. lutea 

 must be kept in hand, or it will become a weed. C. nobilis is 

 good; it grows a foot high, and bears yellow flowers from May 

 onward (see the Botanical Magazine, t. 1953). Wilsoni, grey leaves; 

 and cheiranthifolia, cream flowers and fern-like foliage, are pretty. 

 Any soil that is not wet and stiff suits. Propagation is by division 

 in spring. 



Corylus, Nut (cor-ylus, from korys, hood, referring to the nut 

 being covered by the calyx. Ord. Cupulif erae) . See Fruit. 



Corypha australis. See Livistona australis. 



Cosmos, Cosmea (cos-mos, from kosmos, beautiful. Ord. Com- 

 positae). A small genus which includes one very useful plant in 

 the annual bipinnatus; the type has purple flowers, but seedsmen 

 sell mixtures which include the purple, white, and others; they 

 flower profusely and long, and the leaves are prettily cut. The 

 height is about 3 ft. (see Annuals for culture). C. diversifolius is a 

 hardy tuberous perennial, with lilac flowers in September (see the 

 Botanical. Magazine, t. 5227); there is a dark variety called atro- 

 sanguineus. 



Cotoneaster (cotoneas-ter, from cotonea, quince (Pliny), and aster 

 (ad instar), like. Ord. Rosaceae). Hardy shrubs, suitable for 

 growing against walls. Most of them grow from 4 to 6 ft. high, and 

 thrive in any well-drained soil. Propagation is by seeds sown when 

 ripe, by cuttings in spring or autumn, and by layers in autumn. 

 The most popular species are microphylla and Simonsii; the former 

 has small, glossy, evergreen foliage, and produces white flowers in 

 spring, followed by scarlet berries (see the Botanical Register, 

 t. 1114). Glacialis (syn. congesta) is a variety of it. Buxifolia is a 

 dwarfer species sometimes used for rockwork. 



Cotyledon, Navelwort (cotyle-don, name given by Pliny. Ord. 

 Crassulaceae) . This, with the additions which have been made to 

 it by modern botanists, is a very large genus. The Echeverias have 

 been added to it, and so have the Pachyphytums and Umbilicuses, 

 with some smaller genera. They are succulents, with glaucous 

 foliage. The Cotyledons proper are of shrubby habit, whereas the 

 Echeverias are low and flattened. The latter were more used in 

 the old carpet-bedding days than they are now. Of the species 



