Propagated by division of the roots in spring or fall. =Calophyllum.= _Guttiferæ._ Increased by cuttings made from the half-ripened shoots, which root freely in sand, if placed under a glass in bottom heat. =Calopogon.= _Orchideæ._ Increased by offsets taken from the tuberous roots. =Calothamnus.= _Myrtaceæ._ Increased by cuttings of young wood, firm at the base. Place in sand and cover with a hand-glass. =Calotis.= _Compositæ._ Increased by divisions of the root. =Calotropis.= _Asclepiadeæ._ Propagated by young cuttings thinly dibbled in a pot of sand, placed under a hand-glass in heat. They must not receive too much moisture, or they will rot. =Caltha= (Marsh-Marigold). _Ranunculaceæ._ Propagated by seeds sown as soon as ripe, or by dividing the roots in early spring, or in summer after flowering. =Calycanthus= (Sweet-scented Shrub Allspice). _Calycanthaceæ._ Increased by seeds sown in a cold-frame; by divisions or offsets, and by layers put down in summer. =Calycophyllum.= _Rubiaceæ._ Propagated by cuttings of half-ripe shoots, which will root in sand, if placed under a bell-glass, in bottom heat. =Calypso.= _Orchideæ._ Increased by offsets. =Calyptranthes.= _Myrtaceæ._ Propagated by layers, or by cuttings placed in heat. =Calystegia= (Hedge Bindweed, Bearbind). _Convolvulaceæ._ Propagated by seeds sown in spring, or by dividing the plants. =Calythrix.= _Myrtaceæ._ Increased by cuttings of the young shoots placed in sand, under a bell-glass in a cool house, in late spring. =Camassia=, Sitocodium. _Liliaceæ._ Propagated by seeds sown in a warm situation out-doors, or in pots or boxes under glass. The young plants should remain at least two years in the seed beds. Also increased by offsets, which are produced very freely, and should be removed either when in a dormant condition, or just previously to starting into fresh growth, and arranged in clumps or lines, placing a little sand about them. =Cambessedesia.= _Melastomaceæ._ Propagated by half-ripened cuttings, which root freely in a mixture of peat and sand, if placed under a glass, in heat. =Camellia=, including Thea (Japanese Rose). _Ternstrœmiaceæ._