The seeds are grey to red-brown , irregularly shaped and slightly flattened.

[2][3][4][5][6] Eucalyptus fasciculosa was first formally described in 1855 by Ferdinand von Mueller in the Transactions and Proceedings of the Victorian Institute for the Advancement of Science.

[7][8] The specific epithet (fasciculosa) is derived from the Latin word fascis meaning "bundle", "packet" or "sheaf",[9] possibly referring to the flower bundles on the ends of the stems.

It is mainly found in the south-east of South Australia, in the Mount Lofty Ranges, Barossa Valley and on Kangaroo Island.

[6][2] The canopy is not dense and other plants are able to grow in the dappled shade provided by the tree.