Nicolle, D. (1 August 2000), A review of the Eucalyptus calycogona group (Myrtaceae) including the description of three new taxa from southern Australia. Nuytsia 13(2): 307, figs 3, 4, 2 (map) [tax. nov.]

• Type: Tailem Bend-Loxton Highway between Mindarie and Wanbi, 34 deg 48 min 31 sec S, 140 deg 13 min 11 sec E, South Australia. 30 July 1994, D.Nicolle 984 (holo: AD; iso: CANB, NSW).

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

taxonomic synonym: Eucalyptus calycogona var. spaffordii Blakely legitimate common name: Square-fruited mallee [n/a]

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

taxonomic synonym: Eucalyptus calycogona subsp. 'Eastern' [n/a]

• APC Dist.: SA, NSW, Vic

Nicolle, D. (2013), Native eucalypts of South Australia: 102-103 [secondary reference]

taxonomic synonym: Eucalyptus calycogona subsp. 'Eastern' [n/a] common name: Gooseberry Mallee [n/a] common name: Square-fruited Mallee [n/a]

• Etymology: The subspecies name is from the Greek trachys meaning 'rough' and basis meaning 'base', referring to the rough bark on the lower stems of this subspecies.

---