Calytrix oldfieldii is a species of flowering plant in the myrtle family Myrtaceae and is endemic to the south-west of Western Australia. It is a glabrous shrub with linear, oblong or egg-shaped leaves and mauve, pink, red, magenta or violet flowers with about 50 to 75 yellow stamens in several rows.
Calytrix oldfieldii is a glabrous shrub that typically grows to a height of . Its leaves are linear, oblong or egg-shaped, long and wide on a petiole long. There are no stipules at the base of the petiole. The flowers are borne on an elliptic or funnel-shaped peduncle long with egg-shaped lobes long. The floral tube is spindle-shaped, long and has 10 ribs. The sepals are fused at the base, with broadly elliptic to egg-shaped lobes long and wide with an awn up to long. The petals are mauve, pink, red, magenta or violet, elliptic to egg-shaped, mostly long and wide, and there are about 50 to 75 yellow stamens in mostly three rows. Flowering mostly occurs from April to November.[1]
Calytrix oldfieldii was first formally described in 1867 by George Bentham in his Flora Australiensis from specimens collected near the Hutt River by Augustus Oldfield.[2] [3] The specific epithet (oldfieldii) honours the collector of the type specimens.[4]
This species of Calytrix grows in low, open heath in gravel or sand, or in tall heath with Xylomelum in sandy clay and in winter-wet areas from the Kalbarri district to the Eneabba district, in the Avon Wheatbelt, Geraldton Sandplains and Yalgoo bioregions of south-western Western Australia.
Calytrix oldfieldii is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.