228 THE NURSERY LIST. 



Dodecatheon (American Cowslip). Primulacece, 



Seeds. The crowns may be divided either in spring or 

 autumn. Cuttings of the whole root can be effectively 

 used, the root being torn off the crown, planted upright, 

 and covered with the sandy soil commonly used in this 

 form of propagation. 



Dog's Bane. See Apocynum. 

 Dog's-tooth Violet. See Erythronium. 

 Dogwood. See Cornus. 



Dolichos. Leguminosce. 



By seeds. Sometimes cuttage or layerage is resorted to. 



Doronicum (Leopard's Bane). Composite. 

 Propagated by seeds and divisions. 



Dorstenia. Urticacetz. 



Seeds may be sown in a hotbed in early spring. Be- 

 fore active growth commences, the plants may be divided. 



Doryanthes. Amaryllidacece. 



Propagated by suckers placed in small pots. 



Downingia, Clintonia. Lobeliacece. 



Seeds should be sown in mild heat in spring. 



Draba (Whitlow Grass). Crucifercs. 



The annuals or biennials are propagated by seeds sown 

 in spring in the open border. The perennials may be 

 propagated by dividing the crowns. 



Dracaena. See Cordyline. 



Dracocephalum (Dragon's Head). Labiates. 



The annuals are grown from seeds, sown in the open 

 in spring. Perennials are increased by dividing the roots, 

 or by cuttings of the young shoots in spring. 



Dracontium. See Amorphophallus. 

 Dragon-tree. See Cordyline 



Drimys, Wintera. Magnoliacece. 



Cuttings made of half-ripened shoots should be inserted 

 in a frame. Seeds, when obtainable. 



