116. Eucalyptus marginata. 



(Sin,, m [Vans. Linn, Sue, vi, 302, [802 

 Jarrah. 



Systematic. A large tree, averaging 100 feet in height, the bark persistenl 

 and fibrous, but being flaky it 1- not a true " Stringybark." Leaves ovate- 

 lanceolate or lanceolate, under 5 inches long, acuminate, falcate, paler underneath ; 

 venation prominent, the intramarginal vein looped and well removed from the 

 edge "i" often quite close, lateral veins numerous, fairly transverse. Peduncles 

 slender, axillary, up to u lines in length, with umbels oi three to twelve flowers. 

 Buds iMi pedicels 2 to 3 lines long ; calyx tube turbinate, and hall as long as the 

 conical, obtuse operculum. 



Fruit. Ovoid-truncate, contracted at the top; rim 



incurved and later depressed ; valves small, 



not or only slightly exserted ; about 9 lines 

 long and 8 line-, in diameter. 



Is a 1 typological specimen il stands idonc in : 

 amongst Eucalyptus fruits. 



Habitat. Western Australia, 



ESSENTIAL OIL. Material was received lor distillation from Western 



Australia in June, 1(304. Two consignments were forwarded, one collected 

 on the Darling Ranges, the other from the sandy Hat country around 

 Perth. The first consisted of leaves from older trees, and was a fair average 

 sample, the other was composed principally oi abnormal leaves. Although 

 necessarily a great diversity in material was thus shown, a- well .1- .1 difference 

 in environment, yet the oils were in very close agreement, both in their chemical 

 and physical propertii - A larger amount oi the lower-boiling terpenes was 

 present in the oil from the abnormal leaves than in that from the older leaves, 

 although the constituents were the same in both samples. I In-- decrease in 

 the amount of the characteristic low-boiling terpene in the older leaves is usual 

 with nio-i Eucalyptus species, and numerous instances oi this fad are recorded 

 throughout this work. We have shown also that the characteristic constituents 

 lor the oils of any species are common to both young and old leaves, the variation 

 being in the amount. 



The crude oils were red in colour, and had an odour indicating aroma- 

 dendral. The oil from the "Jarrah" is closely associated with those oi such 

 -pecies as the type /•". tereticomis and /■.'. punctata var. didyma, and there is strong 

 evidence to support the idea thai this class oi trees is more closely associated 

 with those Eucalypts known as " Boxe than to an\ other group. Phellan- 



drene 1 ould not he detected, nor was it to he expected in this class oi Eucalyptus 

 trees. Pinene was preseni in -mall amount, while cymene was a pronounced 

 ■ mii-iii ueiit . The amount pi cineol was less than 10 per cenl in the firsi fraction, 



