Naturalisation in Extra-Tropical Countries. 159 



Dorema Ammoniacum, D. Don. 



From Persia extending to Afghanistan and Turkestan, up to 

 4,000 feet. A tall perennial herb, yielding the gum-resin Am- 

 moniacum, which might be obtained from plants introduced, 

 especially as this plant will grow in dry regions. 



Dovyalis zizyphoides, E. Meyer. 



South-Africa. A thorny shrub. Berries used for a delicious 

 preserve [Mrs. Barber]. So also the fruits of D. celastroides 

 (Sonder). 



Dracaena cinnabrina, B. Balfour. 



Socotra. Attains 25 feet height and three feet stem-thickness. 

 One of the most remarkable plants extant, for scenic culture par- 

 ticularly eligible, the branches short terminal and almost 

 horizontally crowded, giving the tree an umbrella-shaped outline. 

 Produces like D. Draco, D. Ombet (Kotschy and Pryritsch) from 

 Nubia and D. schizantha (Baker) from Samoli red dye-resin. 



Dracaena Draco, Linne. 



The Dragonblood-Tree of the Canary-Islands. An imposing 

 feature in scenic horticulture ; it yields one kind of Dragonblood- 

 resin. The famed Dragon-tree of Teneriffe, measured in 1831, 

 showed 46 feet stem-circumference, and even at the commencement 

 of the 15th century was celebrated for its age and large proportions. 

 A Dracaena is cultivated on Kilimanjaro up to 7,000 feet for 

 hedges [H. Johnston]. 



Dracocephalum BXoldavica, Linne. 



Northern and Middle Asia. An annual showy scent-herb : also 

 of some medicinal value and particularly for culinary condiment. 



Drimys Winter!, R, and G. Forster. 



Extra-tropical South- America. The Canelo of Chili, sacred 

 under the name of Boighe to the original inhabitants. Attains in 

 river-valleys a height of 60 feet. The wood never attacked by 

 insects [Dr. Philippi]. Bark used for medicinal purposes. The 

 Australian and New Zealand species may be equally valuable. D. 

 aromatica (F. v. M.) is particularly burning- spicy, even in its 

 foliage. 



Duboisia Hopwoodii, F, v. Mueller. 



The Pitury. Inland desert-regions from New South Wales and 

 Queensland to near the west-coast of Australia. " This shrub 

 deserves cultivation on account of its highly stimulating properties. 

 D. myoporoides (R. Br.) of East- Australia and New Caledonia has 

 come into use for ophthalmic surgery. The alkaloid of the latter, 

 duboisin, is allied to piturin, and important as a mydriatic [Ban- 



