164 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Olibanum (Boswellia serrata). — Supposed to be the frankincense 

 of the ancients. 



Opoponax (Opoponax Chironium). — From the south of Europe, 

 in habit like a parsnip ; 6 feet high ; yields a fragrant gum 

 resin, very aromatic, but now not much used. 



Orchids. — A large number of tropical species, are very fragrant, 

 the white and green flowered kinds especially at night, others 

 at different periods of the day. A good list is given in 

 Donald M'Donald's " Sweet-scented Flowers and Fragrant 

 Leaves," pp. 85-90. Vanilla is the fruit pods of Vanilla 

 planifolia, &c, used in flavouring chocolate and confectionery. 

 Orchids rarely possess a perfume that is not also yielded by 

 other flowers. Anguloa Clowesii smells of Fenugreek ; Den- 

 drobium macrophyllum like Turkey Khubarb ; Lycaste 

 Harrisoni smells like 'roasted Apples ; Odontoglossum Rcezlii 

 like Wild Field Rose (R. arvensis). 



Osmanthus (Osmanthus fragrans) and other species (see Olea). 



Oswego Tea (Monarda didyma). 



Pancratium (Hymenocallis) fragrans (Wedding Lilies) and other 

 species. — Deliciously fragrant. 



Patchouli (Pogostemon Patchouli). — A low soft-leaved labiate 

 shrub with scented leaves that were formerly used to scent 

 the Indian shawls. 



Pelargonium (Geranium). — Many species and varieties of the 

 Cape Pelargonia have sweet-scented foliage, and are much 

 grown for the decoration of rooms and conservatories on that 

 account. Their dried leaves are useful for pot-pourri, &c. A 

 good list of the scented kinds may be found at p. 92 of 

 M'Donald's book already cited (see Books). 



Pergularia (P. odoratissima). — The flowers are deliciously 

 fragrant and yield a choice perfume. 



Philadelphus (Mock Orange, Syringa). — All the species and 

 varieties bear sweet-scented flowers, similar to Orange blossoms 

 in the bud state. The green leaves possess a flavour similar to 

 that of Cucumber, and may be used sparingly in claret-cup 

 as a substitute if Cucumbers are not available. 



Pimento, or All Spice Tree (Pimento officinalis and P. acris). — 

 The last named being largely used in making West Indian 

 bay rum. In 1880 the exports of Pimento from Trinidad 

 = £46,704, and in 1896 they had increased to £90,046. 



