Hypocalymma sylvestre commonly known as Chittering myrtle,[2] is a species of flowering in the myrtle family Myrtaceae, and is endemic to a restricted part of the south-west of Western Australia.

It is a spreading shrub, with broadly egg-shaped to heart-shaped leaves, and pale yellow flowers with 100 to 200 stamens in several rows.

[2][3][4][5] Hypocalymma sylvestre was first formally described in 2003 by Arne Strid and Greg Keighery in the Nordic Journal of Botany from specimens collected near Chittering in 1998.

[3] Chittering myrtle is found in woodland and on lateritic hilltops in powderbark wandoo in an area centred around Chittering in the south-west of Western Australia, where it grows in sandy-loamy soils.

[2] Chittering myrtle is listed as "Threatened Flora (Declared Rare Flora — Extant)" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.