266 PROPAGATION" OF PLANTS. 



cultivated in gardens. The foreign species are mostly tender in the 

 North, although a recently introduced Japan species ( C. larbincrvis], is 

 moderately hardy. Propagated by seeds, layers, division of the clumps, 

 and by cuttings of the ripe wood. 



Cleyera. Handsome evergreen shrubs blooming in spring ; flowers, 

 white, or yellowish-white ; fragrant. One species from Japan and the 

 other from Jamaica. Not hardy in our Northern States. Propagated 

 from green cuttings. 



Codiceum, (Croton). A small genus of omamental-foliagcd, ever- 

 green shrubs, natives of tropical countries ; consequently require a Ligh 

 temperature to insure health and vigorous growth. There is an im- 

 mense number of varieties in cultivation, all of which have probably 

 descended from less than a half dozen species. They are more com- 

 monly cultivated under the generic name of Croton, and are now very 

 popular for decorative purposes. Propagated by seed to produce new 

 varieties, and these by cuttings of the ends of the leading shoots and 

 branches planted in sand, in frames or under bell glasses, giving strong 

 heat and a confined, moist atmosphere. 



Colutea (Bladder Senna). A genus of a few species of ornamental, 

 deciduous, hardy shrubs, with pea-shaped, yellowish flowers, and seeds 

 in bladdery pods ; hence, the common English name. Propagated by 

 seeds, or ripe wood cuttings taken off in the autumn and treated as 

 usual with mature wood cuttings. 



Comptonia (Sweet Fern). Only one species, the C. asplenifolia, a 

 very common and familiar low-growing shrub, with fragrant, fern-like 

 foliage. It is seldom cultivated. Propagated by dividing the clumps, 

 and by layering in autumn. 



Cordta. A genus of about two hundred species of tropical, ever- 

 green trees and shrubs, two of which are found indigenous or naturalized 

 along the southern border of the United States. A few of the species 

 are cultivated as greenhouse shrubs in European gardens. Propagated 

 by soft or mature cuttings under glass. 



Corema (Portugal Crakebcrry). Small, low-growing, Heath-like 

 shrubs. Only two species in the genus. Flowers, dioecious. One 

 species indigenous to our Northeast Coast and Newfoundland, the 

 other to Southwestern Europe. Propagated by cuttings taken off in 

 summer and planted under glass. 



Cornus (Dogwood, Cornel). A genus of about twenty-five species, 

 all but one belonging to the Northern Hemisphere and more than half 

 of these indigenous to the United States. They are mostly hardy, decid- 

 uous shrubs and small trees ; rarely herbs. A few of the species and 

 then- varieties cultivated for ornament and their edible fruit ; among the 

 latter, the European Cornel (C. mas.} is a familiar shrub in gardens. 

 The American Flowering Dogwood (C.florida) is a conspicuous tree in 

 oui- forest in early spring. A weeping variety (C. florida pcndula), and 



