Cornus (Dogwood Osier). Cornaceæ.
Increased by seed, suckers of soft wood, layers or cuttings. The herbaceous species, C. Canadensis and C. Suecica, may be increased by division, as also by seeds. The willow-like cornuses grow from cuttings of ripe wood. Named varieties and some species are budded in many cases, especially all the weak-growing sorts. Cornus Mas, raised from seed, is the favorite stock. Shield-budding in late summer and veneer-grafting are most successful. (See [Fig. 44].)
Coronilla. Leguminosæ.
By seeds sown as soon as ripe. The hardy species by division. Cuttings strike freely if placed in cold-frames or a cool house under a hand-glass in spring, and when calloused, introduced to gentle bottom heat.
Correa. Rutaceæ.
Seeds. May be propagated by cuttings very readily. Varieties are usually grafted on C. alba.
Cortusa (Bear’s-ear Sanicle). Primulaceæ.
Increased by seed sown as soon as ripe in a cold-frame; also by carefully dividing the roots.
Coryanthes. See [Stanhopea].