Caustis pentandra

{{short description|Species of plant}}

{{Speciesbox

|name = Thick twist rush

|image = Rush Basin Dam Track Ku-ring-gai Chase.jpg

|image_caption = Ku-ring-gai Chase National Park, Australia

|status =

|status_system =

|genus = Caustis

|species = pentandra

|authority = R.Br.

}}

Caustis pentandra, known as the thick twist rush is a widely distributed grass like plant found in many parts of Australia. It may grow to 2 metres tall, often seen in dry open forest, or moist heathland.{{cite web |title=Caustis flexuosa|work= PlantNET - NSW Flora Online|url=http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Caustis~pentandra|accessdate=2011-09-22}} Stems are a shiny pale green. The specific epithet pentandra is derived from the ancient Greek language, referring to five stamens.Les Robinson - Field Guide to the Native Plants of Sydney, {{ISBN|978-0-7318-1211-0}} page 283 This species first appeared in scientific literature in the year 1810, in the Prodromus Florae Novae Hollandiae, authored by the prolific Scottish botanist Robert Brown.