1020 
INDIAN MEDICINAL PLANTS. 
The following table will giro some idea as to the differences in the 
physical properties and chemical composition of the two oils : 
Colour 
Odour 
Specific gravity 
Oil from flowers. 
Red 
Pleasant, somewhat 
peppermint like. 
24'5° 
n-f*r 0 923 
Oil from leaves. 
Yellow 
Vory pleasant, resembl- 
ing lemon-grass. 
26 76° 
D 
15 ° 
0-895 
Optical Rotation Colour too deep to 
allow of determination. [o]D —0.87.' 
Refractive Index 25' 28 5' 
»D 1 4683 »D 14822 
Solubility in 70'4 alcohol 1 part in 28 parts 1 part in 2 parts 
Saponification value 149-5 44-25 
Acetyl value 199 1414. 
977 . Pogostemon plectranthoides, Desf., h.f.b.i., 
iv. 632 . 
Vern. — PcLngla (Deccan) and Konkan also P&ngla. 
Habitat. — Western Himalaya, from Nepal to Simla; Lower 
Bengal and Beliar. The Concan, Ganara and the Circars. 
A strongly-scented, large, gregarious, shrubby, hoary, pubes- 
cent bush ; branches round, often dark purple. Young parts 
tomentose. Leaves opposite, stalked ovate acute, doubly-toothed 
or serrate, long pointed, 3-Gin , longer than the petiole. Panicle 
usually elongate; whorls subsecured, crowded in large cylindric 
spikes. Floral leaves bract-like, hairy glandular, ovate acute. 
Flowers hardly £in. long, white tinged with, pink. Calyx hirsute, 
tubular 5-toothed. Calyx-teeth shortly triangular lanceolate, 
ciliate, nearly equal. Corolla-tube, curved, longer than the 
calyx. Limb spreading, 4-lobed, lobes nearly equal, obtuse. 
Stamens 4 nearly equal, far protruding. Filaments lilac, bearded 
with long, lilac, beaded hairs (Collett and J. D. Hooker). 
Use . — Used like P. p-iroiflorus. (Syn. P. purpuricaulis, Dalz.) 
It is the source of the phdngla (see the correspondence on the 
subject, pp. 243-246. of Vol. I of Report Proceed Central Indigen 
Drugs Com.) 
978 . ?. purpurascens, Dalz., h.f.b.i., iv. 632 . 
Habitat . — Deccan and Manipur. Dr. Watt says : “It is a very 
striking species and has the somewhat remarkable distribution 
