Platysace cirrosa

{{Short description|Species of herb}}

{{Speciesbox

|image =

|image_caption =

|genus = Platysace

|species = cirrosa

|authority = Bunge{{cite web |title=Platysace cirrosa |url=https://biodiversity.org.au/nsl/services/apc-format/display/80757 |website=Australian Plant Census |accessdate=5 March 2024}}

|synonyms =

}}

Platysace cirrosa, commonly known as karna, is a twining, perennial herb or climber that is endemic to the south-west of Western Australia. The Noongar name for the plant is kanna.{{cite web|url=http://www.kippleonline.net/bobhoward/plantsframe.html|title=Noongar names for plants|accessdate=12 December 2016|publisher=kippleonline.net|url-status=dead|archiveurl=https://web.archive.org/web/20161120071826/http://www.kippleonline.net/bobhoward/plantsframe.html|archivedate=20 November 2016}} It is leafless, sometimes with a few very small scale-like leaves, and flowers arranged in umbels with overlapping yellow petals and flattened fruit.

==Description==

Platysace cirrosa is a twining, tuberous, perennial herb or climber, that is usually leafless or with very small, tapering scale-like leaves. The flowers are arranged on the ends of branches in compound umbels with a few small, narrow involucral bracts and blunt, yellow, overlapping petals. Flowering occurs between January and March and the fruit is flattened, about {{cvt|6.5|mm}} wide and {{cvt|5.4|mm}} long.{{FloraBase|name=Platysace cirrosa|id=6247}}{{cite book |last1=Bentham |first1=George |title=Flora Australiensis |date=1867 |volume= 3 |publisher=Lovell Reeve & Co. |location=London |page=354 |url=https://www.biodiversitylibrary.org/item/41807#page/362/mode/1up |access-date=6 March 2024}}