1020 INDIAN MEDICINAL PLANTS. 



The following table will give some idea as to the differences in the 

 physical properties and chemical composition of the two oils : 





Oil from flowers. 



Oil from leaves. 



Colour 



Red 



Yellow 



Odour 



Pleasant, somewhat 



Very pleasant, resembl- 





peppermint like. 



ing lemon-grass. 



Specific gravity 



24*5° 

 n-jpr 0-923 



B ™1K 0-895 

 D 15° 



Optical Rotation 



Colour too deep to 







allow of determination 



, [o]D —0.87.° 



Refractive Index 



^° 1.JAQQ 



28 ' 5S WRM 



nD LWW "D 



Solubility in 70% alcohol 1 part in 28 parts 1 part in 2 parts 



Saponification value 149*5 44*25 



Acetyl value 199 14r4, 



977. Pogostemon plectranthoides, Desf., h.f.b.l, 

 iv. 632. 



Vern.—Pangla (Deccan) and Konkan also Pangla. 



Habitat— Western Himalaya, from Nepal to Simla; Lower 

 Bengal and Behar. The Concan, Canara 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, 3-6in., 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. pirviflorus. (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. P. purpuraseens, Dalz., h.f.b.l, iv. 632. 



Habitat. — Deccan and Manipur. Dr. Watt says : "It is a very 

 striking species and has the somewhat remarkable distribution 



