two times as long as broad, and pedicels long; Eucalyptus tereticornis subsp. mediana Brooker & Slee has opercula that are not expanded at the base, juvenile leaves that are dull bluish, egg-shaped to round, up to one to two times as long as broad, and pedicels long; Eucalyptus tereticornis subsp. rotunda A.R.Bean has opercula that are not expanded at the base, juvenile leaves that are green, round and up to 1.2 times as long as broad; Eucalyptus tereticornis Sm. subsp. tereticornis has opercula expanded at the base and juvenile leaves that are lance-shaped to egg-shaped, and two to three times longer than wide. Distribution and habitat The species has a wide distribution, occurring over the widest range of latitudes of any Eucalyptus species, occurring from southern Papua New Guinea at latitude 15°S, to southeastern Victoria at latitude 38°S. The forest red gum is one of the key canopy species of the threatened Cumberland Plain Woodlands. Subspecies basaltica grows in eucalypt woodland from Kroombit Tops to near Sydney with a disjunct population in the Carnarvon Range. Subspecies mediana is endemic to eastern Victoria where it grows near river banks, wetlands, low hills and plains. Subspecies rotunda is endemic to a small area near Mitchell in Queensland, growing along creek banks. Subspecies tereticornis is the most widely distributed of the four subspecies and grows in open forest from the Cape York Peninsula in Queensland, to near Bega in southern New South Wales and as far inland as Roma. It is also known from the Central and Oro Provinces in Papua New Guinea. Uses The tree has a strong, hard and durable heartwood, with a density of about 1100 kg m−3. It is used for construction in heavy engineering, such as for railway sleepers. The leaves of E. tereticornis are used in the production of cineole based eucalyptus oil. Gallery See also List of Eucalyptus species References tereticornis Myrtales of Australia Trees of Australia Flora of New South Wales Flora of Queensland Flora of Victoria (Australia) Taxa named by James Edward Smith