Cyanothamnus rigens
{{Short description|Species of flowering plant}}
{{speciesbox
|name = Stiff boronia
|status =
|status_system =
|image = Boronia rigens.jpg
|image_caption = Cyanothamnus rigens in Morton National Park
|taxon = Cyanothamnus rigens
|authority = (Cheel) Duretto & Heslewood{{cite web |title=Cyanothamnus rigens |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77211068-1 |publisher=Plants of the World Online |access-date=22 September 2021 |archive-date=22 September 2021 |archive-url=https://web.archive.org/web/20210922052959/http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77211068-1 |url-status=live }}
|range_map = Boronia rigens DistMap102.png
|range_map_caption = Occurrence data from Australasian Virtual Herbarium
|}}
Cyanothamnus rigenss, commonly known as the stiff boronia, is a plant in the citrus family Rutaceae and is endemic to south-eastern New South Wales in Australia. It is a low, compact shrub with mostly trifoliate, glandular leaves and white to pale pink, four-petalled flowers in the leaf axils.
Description
Cyanothamnus rigens is a compact shrub that grows to a height of {{convert|20-40|cm|in|sigfig=1|abbr=on}} with more or less hairy younger stems. The leaves are trifoliate with a petiole {{convert|1-4|mm|in|sigfig=1|abbr=on}} long. The leaflets are thick, often warty, narrow elliptic, {{convert|3-6|mm|in|sigfig=1|abbr=on}} long and {{convert|1-2|mm|in|sigfig=1|abbr=on}} wide. The flowers are white to pale pink and are arranged singly in leaf axils on a pedicel {{convert|1-3|mm|in|sigfig=1|abbr=on}} long. The four sepals are triangular to broadly egg-shaped, {{convert|1-3|mm|in|sigfig=1|abbr=on}} long, {{convert|0.5-1.5|mm|in|sigfig=1|abbr=on}} wide and hairy. The four petals are {{convert|2.5-3.5|mm|in|sigfig=2|abbr=on}} long and {{convert|1-2.5|mm|in|sigfig=1|abbr=on}} wide. The eight stamens alternate in length with those near the sepals slightly longer than those near the petals. The stigma is about the same width as the style. Flowering occurs from July to August and the fruit is a mostly glabrous capsule {{convert|2.5-3.5|mm|in|sigfig=2|abbr=on}} long and {{convert|1.5-2|mm|in|sigfig=1|abbr=on}} wide.{{cite web |title=Boronia rigens |url=http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Boronia~rigens |publisher=Royal Botanic Garden Sydney |accessdate=13 February 2019 |archive-date=13 February 2019 |archive-url=https://web.archive.org/web/20190213183758/http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Boronia~rigens |url-status=live }}{{cite journal |last1=Neish |first1=Peter G. |last2=Duretto |first2=Marco F. |title=The taxonomy of Boronia anemonifolia and B. rigens (Boronia sect. Cyanothamnus, Rutaceae) |journal=Muelleria |date=2000 |volume=14 |pages=13–15 |url=https://www.biodiversitylibrary.org/item/208804#page/15/mode/1up |accessdate=22 September 2021 |archive-date=22 September 2021 |archive-url=https://web.archive.org/web/20210922052953/https://www.biodiversitylibrary.org/item/208804#page/15/mode/1up |url-status=live }}
Taxonomy and naming
The stiff boronia was first formally described in 1863 by George Bentham who gave it the name Boronia polygalifolia var. robusta and published the name in Flora Australiensis.{{cite web|title=Boronia polygalifolia var. robusta|url= https://id.biodiversity.org.au/instance/apni/466242 |publisher=APNI|accessdate=13 February 2019}}{{cite book |last1=Bentham |first1=George |last2=von Mueller |first2=Ferdinand |title=Flora Australiensis (Volume 1) |date=1863 |publisher=Lovell Reeve and Co. |location=London |page=321 |url=https://www.biodiversitylibrary.org/item/3669#page/379/mode/1up |accessdate=13 February 2019 |archive-date=29 September 2020 |archive-url=https://web.archive.org/web/20200929115158/https://www.biodiversitylibrary.org/item/3669#page/379/mode/1up |url-status=live }} In 1929 Edwin Cheel gave it the name Boronia rigens and published the description in Journal and Proceedings of the Royal Society of New South Wales.{{cite web|title=Boronia rigens|url= https://id.biodiversity.org.au/instance/apni/466421 |publisher=APNI|accessdate=13 February 2019}}{{cite journal |last1=Cheel |first1=Edwin |title=Further notes on the genus Boronia |journal=Journal and Proceedings of the Royal Society of New South Wales |date=1929 |volume=62 |pages=297–298 |url=https://www.biodiversitylibrary.org/item/174265#page/381/mode/1up |accessdate=13 February 2019}} In a 2013 paper in the journal Taxon, Marco Duretto and others changed the name to Cyanothamnus rigens on the basis of cladistic analysis.{{cite journal |last1=Duretto |first1=Marco F. |last2=Heslewood |first2=Margaret M. |last3=Bayly |first3=Michael J. |title=Boronia (Rutaceae) is polyphyletic: Reinstating Cyanothamnus and the problems associated with inappropriately defined outgroups |journal=Taxon |date=2020 |volume=69 |issue=3 |pages=481–499 |doi=10.1002/tax.12242}} The specific epithet (rigens) possibly refers to the habit of this species compared to that of B. polygalifolia and B. nana''.
Distribution and habitat
References
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Category:Flora of New South Wales