Juncus australis

Plate 1 figs. a–h · 8 separate observations

Juncus australis, photographed by Paul Bell-Butler — fig. c Paul Bell-Butler, CC BY 4.0 / obs. 174758133

Juncus australis, photographed by Joe Potter Butler — fig. d Joe Potter Butler, CC BY 4.0 / obs. 160382490

Juncus australis, photographed by naturewatchwidow — fig. g naturewatchwidow, CC BY 4.0 / obs. 108257918

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

The specimen a real sheet, in a real collection

Herbarium: Royal Botanic Gardens, Kew
Accession: K000906707
Filed as: Juncus australis Hook.fil.
Det. by: Johnson, L.A.S.
Collected: s.coll. 1842-12-05
Origin: AU
The sheet: View the digitised specimen (CC BY 4.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Native range 7 botanical countries

Native distribution of Juncus australis, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows. Regions too small to draw at this scale are marked with a dot.

Region	TDWG code	Continent
Kermadec Is.	KER	AUSTRALASIA
New South Wales	NSW
New Zealand North	NZN
New Zealand South	NZS
South Australia	SOA
Tasmania	TAS
Victoria	VIC

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Where it actually grows measured, from 143 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-0.9 °C	4.5 °C	9.9 °C
Warmest month, mean daily high	17.3 °C	21.3 °C	26.1 °C
Annual rainfall	641 mm	936 mm	1,552 mm
Rainfall in the driest quarter	117 mm	197 mm	305 mm

It is found where winters bring light frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 143 research-grade observations of Juncus australis that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.