DILLENIA DISPORUM. 227 



Dillenia. Dilleniacea. 



Seeds, which, however, are grown with much difficulty. 

 Cuttings of half-ripened wood may be placed in sand, 

 under a frame, in bottom heat. 



Dimorphanthus. See Aralia. 



Dion, Platyzamia. Cycadacece. 



Propagated by seed. See Cycas. 



Dionasa. Droseracecz. 



Propagated sometimes by seed; usually by dividing 

 the plants. 



Dioscorea (Yam). Dioscoreacece. 



The tubers may be divided in autumn or spring, when 

 not growing. Start in heat. Seeds are sometimes used ; 

 so are the tubers which form in the axils by the leaves. 

 Stove species can be propagated by cuttings of the half- 

 ripened wood. 



Diospyros (Date Plum, Persimmon). Ebenacecz. 



Seeds are used for the hardy species. Also by cuttings 

 of half-ripened shoots. Those requiring stove heat strike 

 best from ripened shoots, placed in sand in a brisk bot- 

 tom heat during spring. See also Persimmon. 



Dipladenia. Apocynacece. 



In spring, when the plants commence new growth, cut- 

 tings from the young shoots are made. These, or single 

 eyes, should be placed in a mixture of sand and peat in 

 good bottom heat. 



Diplothemium. Palmacece. 



Propagation is effected by seeds. 



Dirca. Thymelceacece. 



Increased by seeds or layers. 



Disa. Orchidacecz. 



D. grandiflora and others of similar habit are propa- 

 gated by offsets. These are best taken off about Decem- 

 ber, and treated like the old plants. (See under Orchids.) 



Disporum, including Prosartes. Liliacece. 



Seeds may be used ; or the plant may be divided in 

 spring before 'active growth commences. 



