The essential oils from the 13 species comprising section Ochraria (the yellow bloodwoods) within the genus Corymbia have been determined. The species fell into two groups according to the a-pinene composition. Corymbia aureola, C. bunites, C. leichhardtii, C. leptoloma, C. peltata, C. dimorpha, C. watsoniana subsp. capillata and C. catenaria all contained high amounts of a-pinene (39—88%), while C. bloxsomei, C. eximia, C. petalophylla, C. scabrida and C. watsoniana subsp. watsoniana contained a-pinene at levels of 5—34%. Numerical methods support this division. The differences in oil content between C. watsoniana subsp. capillata and C. catenaria seem to support the raising of the latter entity to species status.