308 ODOROGRAPHIA. 
Anthers double, the lower ones have a spur-like process projecting 
downwards and outwards. 
Origanum Indicum is only another name for Pogostemon Heyne- 
anum of Benth., figured in Wallich’s Plant. As. Rar. 1. p. 31, 
Rheede’s Hortus Malabaricus, x. tab. 77, and Wight’s Icones, 
tab. 1440. This plant, as above observed, is probably a mere 
variety of the true Patchouli, with longer spikes. 
Inp1an GRASS-OILS. 
Of the genus of Grasses belonging to the tribe Andropogone 
about 25 species are met with in India; of these, four or five are 
of commercial interest as yielding the oils known as “ Grass-oils.”’ 
The greatest confusion has existed in the identification of the 
plants yielding the essential oils from this genus, and much 
uncertainty yet appears to exist in Europe in the assignment of 
each oil to its proper botanical source; that is to say, in the 
identification of nearly allied plants which afford distinct oils 
known commercially under various names in London, Paris, and 
the East. The trade names in London of the four principal oils, 
having such a variety of equivalents in the vernacular of Egypt, 
Turkey, and India, and the plants which these oils are derived 
from being known in the various provinces of India under such 
a number of local dialects, it is not surprising that errors creep 
into the literature of a subject so difficult as that of the identifi- 
cation of the plants which yield the four oils known on the 
London Market as “ Citronella,’ Lemon-grass, Ginger-grass, and 
Vetiver. Had I not known personally one of the largest growers 
and distillers in the East, who was as well acquainted with the Malay 
and Indian dialects as he was with the cultivation of the plants, 
I might have been led by text-books to believe in the existence 
of a great number of plants yielding various oils under many 
names. ‘The European and Vernacular names are very numerous, 
but the oils are four (unless rectified or adulterated oils be 
counted), and the plants yielding them are four (unless a 
sub-genus, or varieties somewhat modified by cultivation be 
counted). 
As regards the Indian botanical nomenclature, there is great 
difficulty experienced by Europeans in ascertaining from the 
