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 McDonald’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 Rhubarb; 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 1886 the exports of Pimento from Trinidad 
= €46,704, and in 1896 they had increased to €90,046. 
