{{short description|Species of flowering plants in the morning glory family}} {{speciesbox |image = Calystegia affinis Brest.jpg |image_caption = |status = CR |status_system= EPBC |genus = Calystegia |species = affinis |authority = Endl.<ref name=IPNI/> |synonyms = {{species list | Convolvulus affinis | (Endl.) Maiden nom. illeg. }} |synonyms_ref = <ref name=IPNI/> }}

'''''Calystegia affinis''''' is a critically endangered species of climbing or creeping vine in the plant family Convolvulaceae.<ref name=sos>{{cite web |url= http://www.environment.nsw.gov.au/determinations/CalystegiaAffinisATwiningPlantEndSpListing.htm |title= NSW Office of Heritage and Environment, Save our Species: ''Calystegia affinis''|accessdate=2018-03-16}}</ref> It is endemic to Lord Howe Island and Norfolk Island.<ref name=sos/> In 2003 only about 45 mature plants were known, with about 40 of those on Norfolk Island.<ref>{{cite web|title=Calystegia affinis (a twining plant) - endangered species listing|url=http://www.environment.nsw.gov.au/determinations/CalystegiaAffinisATwiningPlantEndSpListing.htm}}</ref><ref>Coyne, Peter. ''Norfolk Island's Fascinating Flora''. Petaurus Press, 2011, p. 61</ref>

==Etymology== The genus name, ''Calystegia'' is derived from the Greek: {{transliteration|grc|kalux}}, "cup", and {{transliteration|grc|stegos}}, "a covering", meaning "a covering cup" and refers to the bracteoles enclosing the calyx. The specific epithet, ''affinis'', is Latin for 'neighbouring',<ref name=Stearn/> which was possibly chosen by Endlicher on the basis of his comment that the species was closely allied to ''Calystegia marginata''.<ref name=Endl/>

==Description== ''Calystegia affinis'' is a thin-stemmed plant in the genus ''Calystegia'' which climbs by twining. It has sparse alternate, arrow-headed leaves about 6&nbsp;cm x 5&nbsp;cm.<ref name=sos/> The flowers are axillary,<ref name=PlantNET/> solitary, pink with five<ref name=PlantNET/> cream longitudinal bands and are funnel-shaped.<ref name=sos/> They have large persistent bracteoles enclosing the calyx which has five sepals and five petals.<ref name=PlantNET/> The fruit is a papery capsule<ref name=sos/> which splits longitudinally into four valves.<ref name=PlantNET/> The plant is thought to reproduce both clonally and by seed.<ref name=sos/>

==Taxonomy== ''Calystegia affinis'' was first described by Endlicher in 1833.<ref name=IPNI/><ref name=Endl/> In 1904, Joseph Maiden renamed it ''Convolvulus affinis'',<ref name=Maiden/> but this is considered an illegal name by the Commonwealth Heads of Australian Herbaria.<ref name=APNI/> The other synonyms<ref name=IPNI/> (given above) are illegal names, with the species concept having been refined by P.S. Green in 1994 in ''Flora of Australia''.<ref name=Green/>

== Conservation status == It is classified as "Critically endangered" under the EPBC Act.<ref>{{SPRAT|id=48909|name=''Calystegia affinis''}}</ref>

==References== <references>

<ref name=APNI>{{cite web|url=https://id.biodiversity.org.au/name/apni/103196 |title=Convolvulaceae ''Calystegia affinis'' Endl. |work=Australian Plant Name Index (APNI) |access-date=1 April 2024}}</ref> <ref name=IPNI>{{cite web|url=https://www.ipni.org/n/265641-1 |title=Convolvulaceae ''Calystegia affinis'' Endl. |work=The International Plant Name Index |access-date=1 April 2024}}</ref> <ref name=Endl>Endlicher, S. (1833) {{cite web|url=https://biodiversitylibrary.org/page/6140275|title=Prodromus Florae Norfolkicae: 51.|accessdate=24 April 2018}}</ref> <ref name=Maiden>Maiden, J.H. (1904), The Flora of Norfolk Island. Part i. Proceedings of the Linnean Society of New South Wales 28(4): 711</ref> <ref name=Green>Green, P.S. in Wilson, A.J.G. (ed.) (1994), Norfolk Island & Lord Howe Island. Flora of Australia 49: 308–309, Fig. 82</ref> <ref name=PlantNET>{{cite web|url=http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Calystegia|title=PlantNET: ''Calystegia''., National Herbarium of NSW, Royal Botanic Gardens, Sydney Australia|accessdate=25 April 2018}}</ref> <ref name=Stearn>Stearn, W.T. (1992) 'Botanical Latin : history, grammar, syntax, terminology and vocabulary. (p. 265)' (Portland, OR. Timber Press)</ref>

</references>

{{Taxonbar|from=Q5024761}}

affinis Category:Flora of Lord Howe Island Category:Flora of Norfolk Island Category:Taxa named by Stephan Endlicher Category:Plants described in 1833