Johnson, L.A.S. & Hill, K.D. (30 June 1999), Systematic studies in the Eucalypts. 9. A review of series Sociales (Eucalyptus subgenus Symphyomyrtus, Section Bisectaria, Myrtaceae). Telopea 8(2): 188, Figs 8, 9 (map) [tax. nov.]

• Type: Western Australia; Shothole Canyon, Cape Range, (22 23'S, 114 01' E), M.I.H.Brooker 5692, 15 Apr 1977 (holo NSW; iso AD, CANB, MEL, PERTH).

• Etymology: "The epithet is from the Latin ultimus, farthest, most distant, in reference to the occurrence at the farthest extreme of the range of the subseries Grasbyanosae."

Nicolle, D., Byrne, M. & Whalen, M. (20 December 2005), A taxonomic revision and morphological variation within Eucalyptus series Subulatae subseries Oleaginae (Myrtaceae) including the oil mallee complex, of south-western Australia. Australian Systematic Botany 18(6): 551-552 [secondary reference]

Centre for Plant Biodiversity Research (2006), EUCLID Edn. 3: - [secondary reference]

Council of Heads of Australasian Herbaria (2006), Australian Plant Census: - APC [secondary reference]

taxonomic synonym: Eucalyptus sp. OO [n/a]

• APC Dist.: WA

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