Micromyrtus uniovulum is a species of flowering plant in the family Myrtaceae and is endemic to a small area in the south-west of Western Australia. It is a low, spreading, sometimes erect shrub with oblong leaves, and white flowers with 10 stamens.
Micromyrtus uniovulum is a low, spreading, sometimes erect shrub that typically grows to a height of up to . Its leaves are narrowly to broadly oblong, long and wide on a petiole long usually with 5 to 8 oil glands on each side of the midvein. The flowers are arranged in racemes up to 30 upper leaf axils and are about in diameter on a peduncle long. The floral tube is long with 5 ribs. The sepals are long and wide. The petals are white, widely spreading and egg-shaped, and there are 10 stamens. Flowering occurs from September to December and the fruit is about long .[1]
Micromyrtus uniovulum was first formally described in 2002 by Barbara Lynette Rye in the journal Nuytsia from specimens collected near Bunny Road in 1999.[2] The specific epithet (uniovulum) means "one egg" and refers to the species having only one ovule in the ovary.
This species is found on the lateritic rises in a mall area west of Three Springs in the Avon Wheatbelt and Geraldton Sandplains bioregions of south-western Western Australia.
Micromyrtus uniovulum is listed as "Priority Two" meaning that it is poorly known and known from only a few locations but is not under imminent threat.[3]