6oo 



BOTANY AND PHARMACOGNOSY. 



Constituents. Volatile oil 3 to 6 per cent., of which over 

 60 per cent, is eucalyptol (cineol), the remainder consisting of 

 d-pinene (eucalypten) and other terpenes ; several resins, one 

 of which is crystalline and colored brownish-red with ferric 

 chloride; a neutral bitter principle; eucalyptic acid; tannin and 

 calcium oxalate. 



Fig. 258. Eucalyptus Globulus: A, young branch with opposite, oblong, dorsiventral, 

 sessile leaves. B, flowering branch with scythe-shaped, petiolate, scattered, bilateral leaves. 

 C, flower-bud showing the detached upper portion of the perianth (operculum or lid) which 

 covers the stamens until they are fully mature. D, longitudinal section of a flower bud 

 showing incurved filaments which curve outwards when the flower matures. E, stamens 

 in two views, F, truncated capsule or pyxis. G, two fertile seeds. H, sterile seed, seeds of 

 this kind usually being most numerous. J, two germinating plants. A-F, after Niedenzu; 

 G-J, after Miiller. 



Allied Plants. The following Eucalypts yield an oil con- 

 sisting principally of eucalyptol and pinene, and in which the 

 eucalyptol exceeds 40 per cent., phellandrene being absent : Euca- 

 lyptus resinifera, E. polyauthema, E. Bchriana, E. Rossii, E. 

 pendula, E. dcalbata, E. tercticornis linearis, E. rostrata borealis, 

 E. maculosa, E. camphora, E. punctata, E. squamosa, E. Bridge- 

 siana, E. goniocalyx^ E. hicolor, E. vivnnalis, E. populifolia, 



