An extract of the aerial parts of Eriostemon australasius Pers.subsp. banksii (A. Cunn. ex Endl .) P.G. Wilson ( Rutaceae ), collected from the Cape York Peninsula, has yielded four novel secondary metabolites. These were identified, by spectroscopic methods, as methyl (E)-4-(3′-methylbut-2′-enyloxy) cinnamate, cis-erioaustralasine [{rel}-1-acetoxymethyl-4,8′-epoxy-3-(1′β,2′β-epoxy-3′β,4′β-para-menth-3′-yl)quinolin-2-one], trans- erioaustralasine [{rel}-1-acetoxymethyl-4,8′-epoxy-3-(1′β,2′β-epoxy-3′β,4′α-para-menth-3′-yl)quinolin-2-one] and furoerioaustralasine [{rel}-2,2′β:4,8′-diepoxy-3-(1′β-hydroxy-3′α,4′α-para-menth-3′-yl) quinoline ]. The structure of cis-erioaustralasine was confirmed by X-ray crystallographic studies. The taxonomic significance of the occurrence of these alkaloids in E. australasius is discussed.

From the aerial parts of Boronia alata a known protolimonoid niloticin and a novel pentanortriterpene boronialatenolide have been isolated. The structure of the novel limonoid was established by extensive n.m.r. studies.

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Two new diterpenes have been isolated from the twigs of Ryparosa acuminata ( Flacourtiaceae ), and identified as 16α,19-dihydroxykauran-20-oic acid δ- lactone and 16α-hydroxykaurane-19,20-dial. Friedelin and eudesmin were also isolated. The structure of the lactone was confirmed by X-ray crystallography.

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