Eucalyptus redunca, commonly known as black marlock, black-barked marlock, wandoo or myrtan, is a tree species in the genus Eucalyptus that is native to Western Australia. E. redunca produces a tannin of the condensed type.
The mallee tree typically grows to a height of 1 to 4.5 metres (3 to 15 ft) but can reach as high as 6 metres (20 ft). It has smooth bark and a lignotuber. It blooms between July and November producing yellow flowers. The bark is smooth and a light light brown colour that becomes grey or dark grey brown and peels off in ribbons. The tree has a well-rounded canopy and is one of the most floriferous eucalypts known.
The disjunct adult leaves disjunct have a narrow lanceolate or lanceolate shape and are basally tapered. The thin concolorous leaves are a dull, green or grey-green colour and are supported by narrowly flattened or channelled petioles. The simple axillary conflorescence has more than eleven flower per umbellaster. The cylindrical or rostrate buds are not glaucous or pruinose. The calyx calyptrate sheds early. Later it will produce cylindrical or hemispherical fruits with a depressed disc and rim-level or exserted valves.
The species was first formally described by the botanist Johannes Conrad Schauer in 1844 in Johann Georg Christian Lehmann's work Myrtaceae. Plantae Preissianae. The only known synonym is Eucalyptus redunca Schauer var. redunca published in 1867 by George Bentham in the work Orders XLVIII. Myrtaceae- LXII. Compositae. Flora Australiensis.
E. redunca is found on undulating low ridges mostly along the south coast in the Great Southern and Goldfields-Esperance regions of Western Australia where it grows in sand-clay soils often over laterite.
The species is associated with the western mallee subgroup which is characterised by several eucalypts including Eucalyptus oleosa, Eucalyptus moderata, Eucalyptus incrassata, Eucalyptus foecunda, Eucalyptus eremophila and Eucalyptus uncinata. The understorey is predominantly shrubby with species of Melaleuca and Acacia along with the occasional Triodia.
- List of Eucalyptus species
- List of honey plants
- Eucalyptus wandoo, first described as Eucalyptus redunca var. elata
- Eucalyptus redunca var. subangusta, Blakely, now known as Eucalyptus subangusta (Blakely) Brooker & Hopper
- Kirby, KS (March 1960). "Induction of tumours by tannin extracts". British Journal of Cancer. 14: 147–50. doi:10.1038/bjc.1960.17. PMC 2074141. PMID 14409278.
- "Eucalyptus redunca". FloraBase. Western Australian Government Department of Parks and Wildlife.
- "Eucalyptus Redunca (Black Marlock)". Westgrow Farm Trees. Retrieved 28 October 2017.
- "Eucalyptus redunca". Eucalink. Royal Botanic Garden, Sydney. Retrieved 28 October 2017.
- "Eucalyptus redunca Schauer". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 28 October 2017.
- "Open mallee woodlands and sparse mallee woodlands" (PDF). Commonwealth of Australia. Retrieved 6 May 2017.
- Eucalyptus redunca var. subangusta on florabase.dec.wa.gov.au
- Data related to Eucalyptus redunca at Wikispecies