The flower buds are arranged in leaf axils in groups of seven on a flattened, unbranched peduncle 8–25 mm (0.31–0.98 in) long, the individual buds on pedicels 2–5 mm (0.079–0.197 in) long.

[4][6] The specific epithet (thamnoides) is derived from the ancient Greek word thamnos meaning "a bush or shrub" with the ending -oides meaning "like",[7] referring to the habit of this species, in contrast to that of E.

[4] In the same edition of Nuytsia, Brooker and Hooper described two subspecies, and the names have been accepted by the Australian Plant Census: Subspecies megista grows on plains and low rises but not on breakaways and occurs between Quairading, the Stirling Range, Cranbrook and Hopetoun.

[4][10] Subspecies thamnoides grows on plains, breakaways, low stony hills and near rivers from near Gnowangerup to the Stirling Range National Park and Jerramungup.

[11] Eucalyptus thamnoides and both subspecies are listed as "not threatened" by the Western Australian Government Department of Parks and Wildlife.