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The biological factors discussed in Part I of this series1 were taken into consideration in this investigation of the composition of the volatile leaf oil of Eucalyptus crenulata Blakely & de Beuze~i l l e .~ This is a very rare species, and in Blakely's classification3 is placed in Section Macrantherae, Series Globulares. It is a small, glaucous, straggly tree, found only on swampy or low-lying graund, and is of very restricted distribution, being known from only two small occurrences-near Buxton (the type locality), and near Yering, both in Victoria. The foliage yielded 0.9% of steam-volatile material, of which about 300,; wab a crystalline solid extracted from the distillation water. The oil which separated had d:: 0.9101; 71g 1.4905; [a]$ -0.2Ei0. acid number 2 .4; ester number 6 2 . 8 ; ester number after acetylation 82.3. I t was found to consist chiefly of yterpinene, p-oymene, and methyl eudesmate (methyl ester of 3,4.5-trimethoxybenzoic acid) together with small quantities of a-pinene, terpinolene, isovaleric aldehyde, and terpin-1-en-4-01. The solid recovered from the distillation waters consisted almost entirely of methyl eudesmate, so that the ester content of the total distillate amounted to approximately 47%. Since y-terpinene was a major component, some or all of the p-cymene may be an artefact formed during isolation or vacuum distillation of the oil. The composition of this oil is unusual for the genus, and differs markedly from the oils of closely related species such as E. pulvede.rzta Sirns, E. cordata Labill., and E. perriniana F. Muell, ex Rodway. Eudesmic acid (later shown by Birch and Elliott4 to be 3,4,5-trimethoxybenzoic acid) 15 as isolated by Smith5 as a saponification product of a fraction from the leaf oil of E. aggreqata Deane & Maiden, in which the acid was considered by Smith to be present as an amyl ester. The population a t Yering shows an occasional tree having features indicating hybridisni with E , ovatu Labill., coextensive with E. cre7zuluta on this site.= However, in a progeny of 20 trees raised from open-pollinated seed from the experimental material from the type locality, no evidence of segregation could be detected, from

The volatile oils of the genus Eucalyptus (family Myrtaceae). III. The leaf oil of E. crenulata Blakely & de Beuzeville