About Stylidium perpusillum Hook.fil.
Stylidium perpusillum, commonly known as the tiny triggerplant, is a dicotyledonous plant in the genus Stylidium of the family Stylidiaceae. It is found in south-west Western Australia. This species is an ephemeral annual, growing to a height between 1.5 and 4 cm. It produces white flowers with undivided posterior corolla petals, which bloom from September to November within its native range. Its natural habitat consists of sand to clay soils in winter-wet depressions located near granitic rocks. S. perpusillum is endemic to southwestern Western Australia, and it is recognized as the smallest species in the genus Stylidium. In his 1908 monograph of the Stylidiaceae family, Johannes Mildbraed described S. perpusillum as also occurring in Victoria and Tasmania, but all collections made since that publication have only found this species in Western Australia.
