Olearia allomii, also known as the Great Barrier tree daisy,[2] is a species of flowering plant in the family Asteraceae.

Leaves oblong, unequal at the base, excessively thick and coriaceous, obtuse, shining, reticulate above, principal veins diverging from the mid-rib nearly at right angles, mid-rib prominent below, often giving the leaf a keeled appearance, leaf covered below with densely appressed, silvery, shining, tomentum, l"-2" long, rather closely set; petioles short, stout; corymbs longer than the leaves, pecluncled, downy, spreading, lax, many-headed, simple or slightly branched.

Heads on stout downy pedicels ¼"-¾ long, large, broad; involuere cylindrical; scales numerous, imbricate, broadly lanceolate, obtuse, puberulous or downy; florets 6-8; rays about 8, broad, notched at the apex, white; pappus brown spreading, feathered.

[2] Kirk noted similarities to the species Olearia haastii, but could identify O. allomii due to the larger size of its parts, dwarf rigid habit, and loose scales.

[3] The species flowers between September and December, and fruits between October and April.